ParkAvenue 1997-1999

Teves II System

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Brake Fluid Reservoir & Seal



Removal & Installation
  1. Disconnect the negative battery cable.
  2.  
  3. Depressurize the accumulator. Make certain the system is completely relieved of all hydraulic pressure.
  4.  
  5. Remove the return hose and drain the brake fluid into a container. Discard the fluid properly.
  6.  
  7. Detach the 2 wire connectors from the fluid level sensor assembly.
  8.  
  9. Remove the reservoir-to-block mounting bolt.
  10.  
  11. Remove the reservoir by carefully prying between the reservoir and the master cylinder.
  12.  

To install:

  1. Lubricate the seals with clean brake fluid.
  2.  
  3. Install the seals and O-ring into the master cylinder body.
  4.  
  5. Push the reservoir into the master cylinder until it is fully seated.
  6.  
  7. Install the reservoir to valve block mounting bracket bolt.
  8.  
  9. Attach the 2 wire connectors to the reservoir cap.
  10.  
  11. Connect the sump hose to the reservoir.
  12.  
  13. Refill the reservoir with clean brake fluid.
  14.  
  15. Connect the negative battery cable.
  16.  

Filling & Bleeding



System Bleeding

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

Front and/or rear brake circuits should be bled using pressure bleeding equipment. The pressure bleeder must be of the diaphragm type and must have a rubber diaphragm between the air supply and brake fluid.

Front Brake Circuit

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999


CAUTION
Do not move vehicle until a firm brake pedal is achieved. Failure to obtain firm brake pedal may result in personal injury and/or property damage.

  1. With the ignition switch OFF , disconnect the negative battery cable.
  2.  
  3. Depressurize the accumulator.
  4.  
  5. Remove the reservoir cap or disconnect the wiring sensor from the fluid level sensor and remove the sensor.
  6.  
  7. Install the special tool No. J-35798 in place of the cap or sensor.
  8.  
  9. Attach the brake bleeder to the adapter tool No. J-35798 and charge to 20 psi (138 kPa).
  10.  
  11. Attach a bleeder hose to 1 front bleeder valve and submerge the other end in a container of clean brake fluid.
  12.  
  13. Open the bleeder valve.
  14.  
  15. Allow the fluid to flow from the bleeder until no air bubbles are seen in the brake fluid.
  16.  
  17. Close the bleeder valve.
  18.  
  19. Repeat Steps 4-7 on the other front bleeder valve.
  20.  
  21. Check the fluid level and adjust as necessary.
  22.  
  23. Remove the brake bleeding equipment and adapters, install the cap or sensor.
  24.  

Rear Brake Circuit

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999


CAUTION
Do not move vehicle until a firm brake pedal is achieved. Failure to obtain firm brake pedal may result in personal injury and/or property damage.

  1. With the ignition switch OFF , disconnect the negative battery cable.
  2.  
  3. Depressurize the accumulator.
  4.  
  5. Check the fluid level in the reservoir and fill as necessary.
  6.  
  7. Turn the ignition switch ON and allow the system to charge. (Listen for the pump motor; it will stop when the system is charged.)
  8.  
  9. Attach a bleeder hose to 1 of the rear bleeder valves and submerge the other end in a container of clean brake fluid.
  10.  
  11. Open the bleeder valve.
  12.  
  13. With the ignition ON , slightly depress the brake pedal for at least 10 seconds.
  14.  
  15. Allow the fluid to flow from the bleeder until no air bubbles are seen in the brake fluid. Repeat the above step if necessary.
  16.  
  17. Close the bleeder valve.
  18.  
  19. Repeat Steps 2-6 on the other rear bleeder valve.
  20.  
  21. Depressurize the system. Inspect the reservoir fluid level and adjust as necessary.
  22.  

System Filling

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

Do not allow the pump to run more than 60 seconds at one time. If the pump must run longer, allow the pump to cool several minutes between 60 second runs.

With the ignition OFF and the negative battery cable disconnected, discharge the pressure within the accumulator. Remove the cap from the reservoir; fill the reservoir to the correct level with DOT 3 fluid.

Use only DOT 3 brake fluid from a clean, sealed container. Use of DOT 4 fluid or DOT 5 silicone fluid is not recommended. Internal damage to the pump components may result.

General Description



The Teves Mark II Anti-lock Brake System (ABS), used on 1986-90 vehicles covered by this manual, is manufactured by Alfred Teves Technologies of West Germany. The 4-wheel system uses a combination of wheel speed sensors and a microprocessor to determine impending wheel lock-up and adjust the brake pressure to maintain the best braking. This system helps the driver maintain the control of the vehicle under heavy braking conditions.


CAUTION
Some procedures in this section require that hydraulic lines, hoses and fitting be disconnected for inspection or TESTING purposes. Before disconnecting any hydraulic lines, hoses or fittings, be sure that the accumulator is fully depressurized. Failure to depressurize the hydraulic accumulator may result in personal injury.

The use of rubber hoses or parts other than those specified for the ABS system may lead to functional problems and/or impaired braking or ABS function. Install all components included in repair kits for this system. Lubricate rubber pats with clean fresh brake fluid to ease assembly. Do not use lubricated shop air to clean or dry components; damage to rubber parts may result.

Under normal driving conditions the Anti-lock braking system functions the same as a standard brake system. The primary difference is that the power assist for normal braking is provided by the booster portion of the hydraulic unit through the use of pressurized brake fluid.

If a wheel locking tendency is noted during a brake application, the ABS system will modulate hydraulic pressure in the individual wheel circuits to prevent any wheel from locking. A separate hydraulic line and 2 specific solenoid valves are provided for each front wheel; both rear wheels share a set of solenoid valves and a single pipe from the master cylinder to the proportioner valve or tee. The proportioner valve splits the right and left rear brake circuits to the wheels.

The ABS system can increase, decrease or hold pressure in each hydraulic circuit depending on signals from the wheel speed sensors and the electronic brake control module.

During an ABS stop, a slight bump or a kick-back will be felt in the brake pedal. This bump will be followed by a series of short pulsations which occur in rapid succession. The brake pedal pulsations will continue until there is no longer a need for the anti-lock function or until the vehicle is stopped. A slight ticking or popping noise may be heard during brake applications with anti-lock. This noise is normal and indicates that the anti-lock system is being used.

During anti-lock stops on dry pavement, the tires may make intermittent chirping noises as they approach lock-up. These noises are considered normal as long as the wheel does not truly lock or skid. When the anti-lock system is being used, the brake pedal may rise even as the brakes are being applied. This is normal. Maintaining a constant force on the pedal will provide the shortest stopping distance.

Vehicles equipped with the Anti-lock Brake System may be stopped by applying normal force to the brake pedal. Although there is no need to push the brake pedal beyond the point where it stops or holds the vehicle, applying more force causes the pedal to travel toward the floor. This extra brake travel is normal.

Vehicles equipped with the Anti-lock Brake System have an amber warning light in the instrument panel marked ANTI-LOCK. Additionally, some models using this system will flash other ABS related messages on the Graphic Control Center or other message panels. The warning light will illuminate if a malfunction in the anti-lock brake system is detected by the electronic controller. In case of an electronic malfunction, the controller will turn on the ANTI-LOCK warning light and disable some or all of the anti-lock system. If only the ANTI-LOCK light is on, normal braking with full assist is operational but there may be reduced or no anti-lock function. If the ANTI-LOCK warning light and the red BRAKE warning light come on at the same time, there may be a fault in the hydraulic brake system.

The ANTI-LOCK light will turn on during the starting of the engine and will usually stay on for approximately 3 seconds after the ignition switch is returned to the RUN position.

Due to system de-pressurization over time, a vehicle not started in several hours may have the BRAKE and ANTI-LOCK warning lights stay on up to 30 seconds when started. This is normal and occurs because the ABS pump must restore the correct pressure within the hydraulic accumulator; both lamps will remain on while this recharging is completed.

The Anti-lock Brake System uses a 2 circuit design so that some braking capacity is still available if hydraulic pressure is lost in 1 circuit. A BRAKE warning light is located on the instrument cluster and is designed to alert the driver of conditions that could result in reduced braking ability. Certain models may display brake related messages on screens or other panels; these messages supplement the brake warning light.

The BRAKE warning light should turn on briefly during engine starting and should remain on whenever the parking brake is not fully released. Additionally, the BRAKE warning lamp will illuminate if a sensor detects low brake fluid, if the pressure switch detects low accumulator pressure or if certain on-board computers run a self-check of the dashboard and instruments.

If the BRAKE warning light stays on longer than 30 seconds after starting the engine, or comes on and stays on while driving, there may be a malfunction in the brake hydraulic system.

System Components
Electronic Brake Control Module (EBCM)

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

The EBCM monitors the speed of each wheel and the electrical status of the hydraulic unit. The EBCM's primary functions are to detect wheel lock-up, control the brake system while in anti-lock mode and monitor the system for proper electrical operation. When one or more wheels approach lock-up during a stop, the EBCM will command appropriate valve positions to modulate brake fluid pressure and provide optimum braking. It will continue to command pressure changes in the system until a locking tendency is no longer noted.

The EBCM is a separate computer used exclusively for control of the anti-lock brake system. The unit also controls the retention and display of the ABS trouble codes when in the diagnostic mode. As the EBCM monitors the system or performs a self-check, it can react to a fault by disabling all or part of the ABS system and illuminating the amber ANTI-LOCK warning light. The EBCM is located on the right side of the dashboard, generally behind the glove box.

Hydraulic Components

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

The ABS uses an integrated hydraulic unit mounted on the firewall or cowl. This unit functions as a brake master cylinder and brake booster. Additionally, the hydraulic unit provides brake fluid pressure modulation for each of the individual wheel circuits as required during braking. The hydraulic unit consists of several individual components.

Accumulator

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

The hydraulic accumulator is used to store brake fluid at high pressure so that a supply of pressurized fluid is available for ABS operation and to provide power assist. The accumulator uses a rubber diaphragm to separate high pressure nitrogen gas from the brake fluid.

Nitrogen in the accumulator is pre-charged to approximately 870 psi. During normal operation, the pump and motor assembly charges the accumulator with brake fluid to an operation range of 2000-2600 psi.

Because of the high pressures in the system, it is extremely important to observe all safety and pressure reduction precautions before performing repairs or diagnosis.

Fluid Level Sensor

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

Found in the fluid reservoir, this sensor is a float which operates 2 reed switches when low fluid level is detected. One switch will cause the red BRAKE warning light to illuminate; the other signals the EBCM and possibly other computers of the low fluid situation. Depending on model and equipment, other messages may be displayed to the driver. The EBCM will engage the amber ANTI-LOCK warning light and disable the ABS function.

Main Valve

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

The main valve is a 2-position valve controlled by the EBCM. Except for TESTING, the valve is open only during ABS stops. When open, the valve allows pressurized brake fluid from the booster servo into the master cylinder front brake circuits to prevent excessive pedal travel.

The main valve is not serviceable as a component; the master cylinder/booster assembly must be replaced.

Master Cylinder/Booster Assembly

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

This portion of the hydraulic unit contains the valves and pistons necessary to develop hydraulic pressure within the brake lines. Pressure in the booster servo circuit is controlled by a spool valve which opens in response to the amount of force applied to the brake pedal. The rate at which the vehicle decelerates depends on the type of road surface and the pressure applied to the brake pedal.

The master cylinder portion uses a 3-circuit configuration during normal braking; individual circuits are provided for each front wheel while a shared circuit is used for the rear wheels. The 3 circuits are isolated so that a leak or malfunction in one will allow continued braking on the others.

The master cylinder/booster is a non-serviceable component and should never be disassembled.



Click image to see an enlarged view

Fig. Teves Mark II ABS hydraulic unit (1) and valve block (2)

Pressure Switch

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

The pressure switch is mounted on the pump/motor assembly and serves 2 major functions, controlling the pump/motor and providing low pressure warning to the EBCM.

The switch will allow the pump/motor to run when system pressure drops below approximately 2030 psi and will shut the pump/motor off when pressure in the accumulator is approximately 2610 psi. Should pressure within the accumulator drop below approximately 1500 psi, internal switches will both signal the EBCM and turn on the red BRAKE warning lamp. If the system re-pressurizes and reaches at least 1900 psi, the switches will reset.

Proportioner Valve

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

Included in the rear brake circuit is a proportioner valve or tee assembly which limits brake pressure build-up at the rear brake calipers. Since the front brakes do the majority of the braking, less pressure is required for the rear brakes under certain conditions. The proportioner valve improves front-to-rear brake balance during normal braking.

Pump/Motor Assembly

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

The ABS system uses a pump and motor assembly located on the left side of the hydraulic unit to pressurize fluid from the reservoir and store it in the accumulator. When pressure within the system drops, the pressure switch on the hydraulic unit grounds the pump motor relay which energizes the pump motor and pump.

The pump/motor assembly is serviceable only as an assembly; the pump must never be disconnected from the motor.

Valve Block

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

The valve block is attached to the right side of the hydraulic unit and includes the 6 solenoid valves used to modulate pressures in the 3 circuits during anti-lock braking. Each circuit is equipped with an inlet and outlet valve.

During normal braking, the inlet valves are open and the outlet valves are closed. When anti-lock control begins, the EBCM switches 12 volts to the appropriate valve circuit. This allows the fluid pressure in each circuit to be increased, decreased or held constant as the situation dictates. The position of the valves can be changed as quickly as 15 times per second when ABS is engaged.

The valve block may be serviced separately from the master cylinder/booster assembly but should never be disassembled.

Wheel Speed Sensors

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

A wheel speed sensor at each wheel transmits speed information to the EBCM by generating a small AC voltage relative to the wheel speed. The voltage is generated by magnetic induction caused by passing a toothed sensor ring past a stationary sensor. The signals are transmitted through a pair of wires which are shielded against interference. The EBCM then calculates wheel speed for each wheel based on the frequency of the AC voltage received from the sensor.



Click image to see an enlarged view

Fig. Location of the Teves Mark II ABS front wheel speed sensor (1) and toothed wheel (2)



Click image to see an enlarged view

Fig. Exploded view of the anti-lock brake rear wheel speed sensor mounting

Hydraulic Accumulator



Removal & Installation
  1. Disconnect the negative battery cable.
  2.  
  3. Depressurize the accumulator. Make certain the system is completely relieved of all hydraulic pressure.
  4.  
  5. Unscrew the hydraulic accumulator from the hydraulic unit.
  6.  
  7. Remove the O-ring from the accumulator.
  8.  

To install:

  1. Lubricate a new O-ring with clean brake fluid and install it on the accumulator.
  2.  
  3. Install the accumulator and tighten to 32 ft. lbs. (43 Nm).
  4.  
  5. Connect the negative battery cable.
  6.  
  7. Turn the ignition switch to the ON position. The BRAKE light should go out within 60 seconds.
  8.  
  9. Check for leakage around the accumulator.
  10.  

Hydraulic Unit



Removal & Installation
  1. Disconnect the negative battery cable.
  2.  
  3. Depressurize the hydraulic accumulator by applying and releasing the brake pedal a minimum of 20-25 times, using 50 lbs. of pedal force. A noticeable change in pedal feel will occur when the pressure is released.
  4.  
  5. Detach the electrical connectors from the ABS hydraulic unit.
  6.  
  7. Unfasten the pump mounting bolts, then move the energy unit to gain access to the brake lines.
  8.  
  9. Disconnect and plug the brake lines from the valve block.
  10.  
  11. Remove the sound insulators, if necessary.
  12.  
  13. Disconnect the pushrod from the brake pedal and push the dust boot forward past the hex on the pushrod.
  14.  
  15. Separate the pushrod halves by unscrewing the 2 pieces.
  16.  
  17. From under the hood, remove the hydraulic unit-to-pushrod mounting bolts.
  18.  
  19. Remove the hydraulic unit from the vehicle; the front part of the pushrod will remain locked into the hydraulic unit.
  20.  



Click image to see an enlarged view

Fig. Exploded view of the hydraulic unit - 1987-90 Teves Mark II ABS system

To install:

  1. Install the hydraulic unit to the pushrod bracket. Tighten the support bolts to 37 ft. lbs. (50 Nm).
  2.  
  3. Install the pushrod halves by threading the 2 pieces together.
  4.  
  5. Install the pushrod to the brake pedal and reposition the dust boot.
  6.  
  7. Install the sound insulators that were removed.
  8.  
  9. Connect the brake lines to the valve block and tighten to 11 ft. lbs. (15 Nm).
  10.  
  11. Reposition the energy unit and replace the pump mounting bolts. Tighten to 71 inch lbs. (8 Nm).
  12.  
  13. Connect the electrical connections at the hydraulic unit.
  14.  
  15. Connect the negative battery cable and bleed the brake system.
  16.  

Pressure Warning Switch



Removal & Installation
  1. Disconnect the negative battery cable.
  2.  
  3. Depressurize the accumulator, as outlined earlier in this section.
  4.  
  5. Detach the electrical connector from the pressure/warning switch.
  6.  
  7. Remove the pressure/warning switch using special tool J-35804 or equivalent.
  8.  
  9. Remove the O-ring from the switch, then discard the O-ring.
  10.  



Click image to see an enlarged view

Fig. Typical location of the pressure warning switch

To install:

  1. Lubricate a new O-ring with clean brake fluid.
  2.  
  3. Install the O-ring on the pressure/warning switch.
  4.  
  5. Install the switch and tighten to 17 ft. lbs. (23 Nm), using the special tool.
  6.  
  7. Attach the electrical connector to the pressure/warning switch.
  8.  
  9. Connect the negative battery cable.
  10.  
  11. Turn the ignition to the ON position. The brake light should go out within 60 seconds.
  12.  
  13. Check for leakage around the switch.
  14.  

Pump & Motor Assembly



Removal & Installation
  1. Disconnect the negative battery cable.
  2.  
  3. Depressurize the accumulator. Make certain the system is completely relieved of all hydraulic pressure.
  4.  
  5. Detach the electrical connector from the pressure switch and the electric motor. Remove the fluid from the reservoir.
  6.  

Do not remove brake fluid from the reservoir using a syringe or other instrument which is contaminated with water, petroleum based fluids or any other foreign material. Contamination of the brake fluid may result in impaired system operation, property damage or personal injury.

  1. Remove the hydraulic accumulator and O-ring.
  2.  
  3. Disconnect the high pressure hose fitting connected to the pump.
  4.  
  5. Remove the pressure hose assembly and O-rings.
  6.  
  7. Disconnect the wire clip then, pull the return hose fitting out of the pump body.
  8.  
  9. Remove the bolt attaching the pump and motor assembly to the main body.
  10.  
  11. Remove the pump and motor assembly by sliding it off of the locating pin.
  12.  

Replace the insulators if damaged or deteriorated.

To install:

  1. Position the pump and motor assembly to the main body.
  2.  
  3. Install the bolt attaching the pump and motor assembly to the main body.
  4.  
  5. Connect the pressure hose assembly.
  6.  
  7. Connect the return hose and fitting into the pump body. Install the wire clip.
  8.  
  9. Install the bolt, O-rings and fitting of the high pressure hose to the pump assembly.
  10.  
  11. Attach the electrical connector to the pump motor.
  12.  
  13. Connect the negative battery cable.
  14.  

Troubleshooting



Clearing Trouble Codes

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

Stored ABS trouble codes should not be cleared until all repairs are completed. The control module will not allow any codes to be cleared until all have been read. After reading each stored code, drive the vehicle at a speed over 18 mph.

Re-read the system; if codes are still present, not all codes were read previously or additional repair is needed.

In the following diagnostic charts, certain special tools may be required. Use of the J-3192 Pinout box or equivalent is required to avoid damage to the connectors at the EBCM; use of J-3204 pressure gauge and J-3204-88 adapter (or equivalents) will be required to measure accumulator pressure. The use of a high-impedance multimeter (DVM or DVOM) is required at all times.

Depressurizing The Hydraulic Unit

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999


CAUTION
On these vehicles, the ABS hydraulic unit accumulator MUST be depressurized before performing any procedures which include disconnecting the fluid lines!

The ABS pump/motor assembly will keep the accumulator charged to a pressure between approximately 2000 and 2600 psi any time the ignition is in the ON or RUN position. The pump/motor cannot operate if the ignition is OFF or if a battery cable is disconnected.

  1. With the ignition OFF or the negative battery cable disconnected, pump the brake pedal a minimum of 25 times using at least 50 lbs. of pedal force each time.
  2.  
  3. A definite increase in pedal effort will be felt as the accumulator becomes discharged.
  4.  
  5. After the increased pedal effort occurs, continue with 5-10 additional brake applications to release any remaining pressure.
  6.  

Displaying ABS Trouble Codes

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

Only certain ABS malfunctions will cause the EBCM to store diagnostic trouble codes. Failures causing a code will generally involve wheel speed sensors, main valve or the inlet and outlet valves. Conditions affecting the pump/motor assembly, the accumulator, pressure switch or fluid level sensor usually do not cause a code to set. Some early 1988 vehicles may not have the ability to store trouble codes. The system functions the same way and the diagnosis and TESTING works about the same too. The only difference is the controller does not have code storing ability.

The EBCM will store trouble codes in a non-volatile memory. These codes remain in memory until erased through use of the correct procedure. The codes are NOT erased by disconnecting the EBCM, disconnecting the battery cable or turning off the ignition. Always be sure to clear the codes from the memory after repairs are made. To read stored ABS trouble codes:

  1. Turn ignition switch to ON . Allow the pump to charge the accumulator; if fully discharged, dash warning lights may stay on up to 30 seconds. If ANTI-LOCK warning light does not go off within 30 seconds, note it.
  2.  
  3. Turn ignition switch to OFF .
  4.  
  5. Remove the cover from the ALDL connector. Enter the diagnostic mode by using a jumper wire to connect pins H and A or to connect pin H to body ground.
  6.  
  7. Turn the ignition switch to ON and count the light flashes for the first digit of the first code. The ANTI-LOCK light should illuminate for 4 seconds before beginning to flash. If, after 4 seconds, the light turns off and stays off, no codes are stored.
  8.  



Click image to see an enlarged view

Fig. Reading and interpreting the Teves Mark II ABS trouble codes

  1. The light will pause for 3 seconds between the first and second digits of the first code and then continue flashing. When counting flashes, count only the ON pulses.
  2.  
  3. When the EBCM is finished transmitting the second digit of the first code, the ANTI-LOCK light will remain on. This last, constant ON should not be counted as a flash. Record the 2-digit code.
  4.  
  5. Without turning the ignition switch OFF , disconnect the jumper from pin H and reconnect it. If an additional code is present, it will be displayed in similar fashion to the first. Record the second code.
  6.  
  7. Repeat the disconnection and reconnection of pin H without changing the ignition switch until no more codes are displayed. The system is capable of storing and displaying 7 codes; the ANTI-LOCK warning light will stay on continuously when all codes have been displayed.
  8.  
  9. After recording each code, remove the jumper from the ALDL, replace the cover and proceed.
  10.  

The ABS trouble codes are not specifically designated current or history codes. If the ANTI-LOCK light is on before entering the ABS diagnostic mode, at least one of the stored codes is current. It is impossible to tell which code is current. If the ANTI-LOCK light is off before entering the diagnostic mode, none of the codes are current.



Click image to see an enlarged view

Fig. Teves Mark II ABS diagnostic trouble code chart

Functional Check

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

Once the visual check has been performed, perform the functional check to determine if the problem is truly ABS related or arises from common faults.

Intermittents

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

Although the ABS trouble codes stored by the EBCM are not identified as current or history codes, these codes may still be useful in diagnosing intermittent conditions.

If an intermittent condition is being diagnosed:

  1. Obtain an accurate description of the circumstances in which the failure occurs.
  2.  
  3. Display and clear any ABS trouble codes which may be present in the EBCM.
  4.  
  5. Test drive the vehicle, attempting to duplicate the failure condition exactly.
  6.  
  7. After duplicating the condition(s), stop the vehicle and display any ABS codes which have set.
  8.  

Most intermittent problems are caused by faulty electrical connections or wiring. Always check for poor mating of connector halves or terminals not fully seated in connector bodies, deformed or damaged terminals and poor terminal to wire connections.

Most failures within the ABS will disable the anti-lock function for the entire ignition cycle, even if the fault clears before the next key off occurrence. There are 3 situations which will allow the ABS to re-engage if the condition is corrected during the ignition cycle. Each of these will illuminate 1 or both dash warning lights.

  1. Low system voltage: If the EBCM detects low voltage, the ANTI-LOCK warning lamp is illuminated. If the correct minimum voltage is restored to the EBCM, normal ABS function will resume.
  2.  
  3. Low brake fluid level: Once detected by the fluid level sensor, this condition illuminates both the BRAKE and ANTI-LOCK warning lights; when the sensor indicates acceptable fluid level, the normal ABS function will resume.
  4.  
  5. Low accumulator pressure: Should the accumulator lose or not develop correct pressure, both the BRAKE and ANTI-LOCK warning lights will illuminate. Full function is restored when the correct pressure is achieved.
  6.  
  7. Any condition interrupting power to either the EBCM or hydraulic unit may cause the warning lights to come on intermittently. These circuits include the main relay, main relay fuse, EBCM fuse, pump motor relay and all related wiring.
  8.  

Service Precautions

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999


CAUTION
This brake system uses a hydraulic accumulator which, when fully charged, contains brake fluid at very high pressure. Before disconnecting any hydraulic lines, hoses or fittings be certain that the accumulator pressure is completely relieved. Failure to depressurize the accumulator may result in personal injury and/or vehicle damage.

  1. If the vehicle is equipped with air bag (SIR) system, always properly disable the system before commencing work on the ABS system.
  2.  
  3. Certain components within the ABS system are not intended to be serviced or repaired individually. Only those components with removal and installation procedures should be serviced.
  4.  
  5. Do not use rubber hoses or other parts not specifically specified for the Teves ABS system. When using repair kits, replace all parts included in the kit. Partial or incorrect repair may lead to functional problems and require the replacement of the hydraulic unit.
  6.  
  7. Lubricate rubber parts with clean, fresh brake fluid to ease assembly. Do not use lubricated shop air to clean parts; damage to rubber components may result.
  8.  
  9. Use only brake fluid from an unopened container. Use of suspect or contaminated brake fluid can reduce system performance and/or durability.
  10.  
  11. When any hydraulic component or line is removed or replaced, it may be necessary to bleed the entire system.
  12.  
  13. A clean repair area is essential. Perform repairs after components have been thoroughly cleaned; use only denatured alcohol to clean components. Do not allow ABS components to come into contact with any substance containing mineral oil; this includes used shop rags.
  14.  
  15. Remove the lock pin before disconnecting Connector Position Assurance (CPA) connectors in the harnesses.
  16.  
  17. The EBCM is a microprocessor similar to other computer units in the vehicle. Insure that the ignition switch is OFF before removing or installing controller harnesses. Avoid static electricity discharge at or near the Controller.
  18.  
  19. Never disconnect any electrical connection with the ignition switch ON unless instructed to do so in a test.
  20.  
  21. Always wear a grounded wrist strap when servicing any control module or component labeled with a Electrostatic Discharge (ESD) symbol.
  22.  
  23. Avoid touching module connector pins.
  24.  
  25. Leave new components and modules in the shipping package until ready to install them.
  26.  
  27. To avoid static discharge, always touch a vehicle ground after sliding across a vehicle seat or walking across carpeted or vinyl floors.
  28.  
  29. Never allow welding cables to lie on, near or across any vehicle electrical wiring.
  30.  
  31. Do not allow extension cords for power tools or droplights to lie on, near or across any vehicle electrical wiring.
  32.  

Visual Inspection

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

Before any system diagnosis is begun, the brake system should be inspected visually for common faults which could disable the ABS or cause a code to set. Check the vehicle carefully for any sign of: binding parking brake or faulty parking brake switch, low brake fluid, system fluid leaks including pump/motor area, failed fuses or fusible links, failed ABS relay, loose or damaged wiring including connectors, harnesses, and insulation wear. Check the mounting and function of the brake calipers at each wheel. Carefully inspect the multi-pin connectors at the EBCM for pushouts or poor connections.

Valve Block Assembly



Removal & Installation
  1. With the ignition OFF disconnect the negative battery cable.
  2.  
  3. Depressurize the accumulator, as outlined earlier in this section.
  4.  
  5. Drain or remove the brake fluid from the reservoir.
  6.  
  7. Disconnect the electrical harness running to the valve block.
  8.  
  9. It may be necessary on some models to disconnect the brake lines from the bottom of the valve block.
  10.  
  11. At the valve block, remove the 3 nuts or 2 nuts and 1 bolt with hex faces only. Remove the valve block assembly and O-rings by sliding the valve block off of the studs. Recover any O-rings or gaskets from the mounting points and/or the fluid line ports.
  12.  


WARNING
Do not attempt to disassemble the valve block by removing the bolts with the recessed drive heads; the unit cannot be overhauled or repaired.



Click image to see an enlarged view

Fig. Remove the fasteners from the positions shown by arrows only; the other fasteners must NOT be disturbed

To install:

  1. Lubricate the O-rings with clean brake fluid.
  2.  
  3. Install the valve block and O-rings onto the master cylinder body.
  4.  
  5. Install the 3 nuts or 2 nuts and 1 bolt, then tighten to 18 ft. lbs. (25 Nm).
  6.  
  7. If removed, connect the brake lines to the bottom of the valve block.
  8.  
  9. Reinstall the hydraulic unit if it was removed.
  10.  
  11. Connect the wiring harnesses.
  12.  
  13. Refill the system or reservoir to the correct level.
  14.  
  15. Connect the negative battery cable.
  16.  
  17. Properly bleed the brake system, as outlined in this section.
  18.  

Wheel Speed Sensors



Removal & Installation
Front

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

  1. Disconnect the negative battery cable.
  2.  
  3. Unplug the sensor connector from the wiring harness.
  4.  
  5. Raise and safely support the vehicle. Remove the tire and wheel assembly.
  6.  
  7. Remove the sensor mounting screw, then remove the sensor.
  8.  



Click image to see an enlarged view

Fig. Front wheel speed sensors - 1987-90 Teves Mark II system and 1991 Teves Mark IV system

To install:

  1. Install the sensor and secure with the sensor mounting screw.
  2.  
  3. Install the tire and wheel assembly. Lower the vehicle.
  4.  
  5. Attach the sensor connector to the wiring harness.
  6.  
  7. Connect the negative battery cable.
  8.  

Rear

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

  1. Disconnect the negative battery cable.
  2.  
  3. Unplug the sensor connector, which is located in the trunk.
  4.  
  5. Raise and safely support the vehicle. Remove the tire and wheel assembly.
  6.  
  7. Unfasten the grommet retaining screws.
  8.  
  9. Remove the sensor mounting bolts, then remove the sensor.
  10.  



Click image to see an enlarged view

Fig. The rear ABS wheel speed sensor is visible once the hub and bearing assembly is removed

To install:

  1. Install the sensor and secure with the sensor mounting bolts.
  2.  
  3. Install the grommet retaining screws.
  4.  
  5. Install the tire and wheel assembly, then carefully lower the vehicle.
  6.  
  7. Attach the sensor connector, located in the trunk.
  8.  
  9. Connect the negative battery cable.
  10.  

 
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