GM S-Series Pick-ups and SUV's 1994-1999 Repair Guide

Electronic Brake Control Module (EBCM)

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REMOVAL & INSTALLATION



  1. Disconnect the negative battery cable.
  2.  
  3. Unplug the electrical connections from the Electronic Brake Control Module (EBCM) and the combination valve.
  4.  
  5. Tag and disconnect the brake lines from the combination valve and the hydraulic lines from the three tube adapters on the Brake Pressure Modulator Valve (BPMV).
  6.  
  7. Unfasten the three 10mm bolts that attach the Electro-Hydraulic Control Unit (EHCU) to the vehicle mounting bracket.
  8.  
  9. Remove the EHCU from the engine compartment.
  10.  
  11. Remove the four T-25 Torx® bolts that attach the EBCM to the BPMV.
  12.  

Do not pry on the EBCM or the BPMV using a mechanical aid or you may damage the EBCM. Do not reuse the EBCM gasket or retaining bolts. Always use a new gasket and bolts.

  1. Separate the EBCM from the BPMV using a light amount of force.
  2.  
  3. Clean the EBCM using a clean dry cloth.
  4.  

To install:

Do not use RTV or any other type of sealant on the gasket mating surfaces.

  1. Position a new EBCM gasket on the BPMV.
  2.  
  3. Position the EBCM onto the BPMV. Make sure the gasket and the components are all perfectly aligned. Install the EBCM-to-BPMV bolts and tighten them to 39 inch lbs. (5 Nm) using an X pattern.
  4.  
  5. Position the EHCU onto the vehicle bracket and install the retaining bolts.
  6.  
  7. Attach the brake lines to the combination valve and tighten the fittings to 18 ft. lbs. (24 Nm).
  8.  
  9. Attach the hydraulic lines to the tube adapters and tighten them until they are snug.
  10.  
  11. Attach all electrical connections to the assembly.
  12.  
  13. Connect the negative battery cable and bleed the brake system.
  14.  

FRONT WHEEL SPEED SENSORS



See Figures 1, 2 and 3

  1. Raise and support the front of the vehicle safely using jackstands.
  2.  
  3. Remove the tire and wheel assembly.
  4.  
  5. Remove the brake caliper from the mounting bracket and support aside from the suspension using a coat hanger or wire. Make sure the brake line is not stretched, kinked or otherwise damaged. The line should never support the weight of the caliper.
  6.  
  7. For 2WD vehicles, remove the hub and rotor assembly. For details, please refer to the brake disc procedure found earlier in this section.
  8.  



Click image to see an enlarged view

Fig. Fig. 1: Front wheel speed sensor/splash shield assembly mounting-2WD vehicles



Click image to see an enlarged view

Fig. Fig. 2: Front wheel speed sensor wire routing-2WD vehicles

  1. For 4WD vehicles, remove the brake disc (please refer to the procedure earlier in this section), then remove the hub and bearing assembly. For details on hub and bearing removal, please refer to the steering knuckle procedure in Suspension & Steering of this repair guide.
  2.  
  3. Unplug the sensor wiring connector.
  4.  
  5. Disconnect the sensor wire from the clip(s) on the upper control arm. On most vehicles this will involve removing the retaining bolt/nut in order to free the clip, then separating the wire from the clip. 4WD vehicles tend to utilize more clips than the 2WD vehicles due to the difference in the front suspension.
  6.  
  7. Remove the splash shield retaining bolts, then remove the shield and sensor assembly.
  8.  

To install:
  1. Mount the sensor and splash shield assembly to the steering knuckle. Install the retaining bolts and tighten them to 19 ft. lbs. (26 Nm) for the outer bolts and 12 ft. lbs. (16 Nm) for the inner bolts.
  2.  



Click image to see an enlarged view

Fig. Fig. 3: Front wheel speed sensor/splash shield assembly mounting-4WD vehicles

  1. Connect the wiring to the clip(s) on the upper control arm. Check the wiring for correct routing. If removed, install and tighten the clip retaining bolt/nuts. The wiring on some vehicles/components may be marked at the appropriate clip mounting position, look for a paint stripe on the sensor wire.
  2.  
  3. Engage the wiring connector.
  4.  
  5. On 4WD vehicles, install the hub and bearing assembly.
  6.  
  7. Install the brake disc.
  8.  
  9. Remove the support, then reposition and secure brake caliper.
  10.  
  11. Install the tire and wheel assembly, then adjust the wheel bearings on 2WD vehicles.
  12.  
  13. Remove the jackstands and carefully lower the vehicle.
  14.  

REAR WHEEL SPEED SENSOR



The sensor is usually located in the left rear of the transmission case on 2WD vehicles and on the transfer case of 4WD vehicles.

The speed sensor may be tested with an ohmmeter; the correct resistance is normally 900-2000 ohms. To remove the speed sensor:

  1. Raise and support the vehicle safely using jackstands.
  2.  
  3. Unplug the electrical connector from the speed sensor.
  4.  
  5. If used, remove the sensor retaining bolt.
  6.  
  7. Remove the speed sensor; have a container handy to catch transmission fluid when the sensor is removed.
  8.  

If equipped with the 4L60-E automatic transmission, use J-38417 or an equivalent speed sensor remover/installer tool whenever the sensor is serviced.

  1. Recover the O-ring used to seal the sensor; inspect it for damage or deterioration.
  2.  

To install:
  1. When installing, coat the new O-ring with a thin film of transmission fluid.
  2.  
  3. Install the O-ring and speed sensor.
  4.  
  5. If a retaining bolt is used, tighten the bolt to 97 inch lbs. (11 Nm) in automatic transmissions or 107 inch lbs. (12 Nm) for manual transmissions.
  6.  
  7. Engage the wire harness to the sensor.
  8.  
  9. Remove the jackstands and carefully lower the vehicle.
  10.  

 
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