DeVille, Eldorado, Seville 1999-2005

Bleeding the ABS System

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  1. Remove the booster vacuum reserve by applying the brakes several times with the ignition OFF .
  2.  
  3. Fill the master cylinder reservoir with brake fluid and keep the reservoir at least one-half full of fluid during the bleeding operation.
  4.  
  5. The master cylinder should be bled before the calipers are bled. If the master cylinder is known or suspected to have air in the bore, bleed as follows:

    Disconnect the forward brake pipe connection at the master cylinder.
     
    Fill the master cylinder with brake fluid until it begins to flow from the forward pipe connector port.
     
    Connect the forward brake pipe to the master cylinder and tighten.
     
    Slowly depress the brake pedal and hold.
     
    Loosen the forward brake pipe connection at the master cylinder to purge air from the cylinder.
     
    Tighten the connection to 24 ft. lbs. (35 Nm).
     
    Slowly release the brake pedal.
     
    Wait 15 seconds and repeat steps until all air is removed from the bore.
     
    Bleed the master cylinder at the rear (cowl end) connection after all the air has been removed at the forward connection.
     
    Check for firm pedal feel and proper brake pedal travel. If the wheel cylinders and calipers do not contain air bleeding may not be necessary.
     

  6.  
  7. Bleed the individual calipers after all air is removed from the master cylinder using the following procedure at each caliper in sequence:
    NOTE
    Do not pump the brake pedal rapidly; pumping pushes the master cylinder secondary piston down the bore which causes difficulty bleeding.



    Attach a transparent tube over the valve and allow tube to hang submerged in a transparent contained filled with brake fluid.
     
    Slowly depress the brake pedal and hold.
     
    Loosen the bleeder valve to purge the air from the cylinder.
     
    Tighten the bleeder screw to 10 ft. lbs. (13 Nm).
     
    Slowly release the pedal.
     
    Wait 15 seconds.
     
    Repeat the sequence until all air is removed from the caliper.
     

  8.  
  9. Bleed brakes in the following sequence:

    Bleed the left front caliper.
     
    Bleed the right front caliper.
     
    Bleed the left rear caliper.
     
    Bleed the right rear caliper.
     

  10.  
  11. Check the brake pedal for sponginess.
  12.  
  13. Repeat the entire bleeding procedure if a low brake pedal or pedal sponginess is encountered.
  14.  

  1. Remove the master cylinder reservoir cap and replace with appropriate adapter.
  2.  
  3. Charge the bleeder to 20-25 psi (140-172 kPa).
  4.  
  5. Connect the hose to the adapter.
  6.  
  7. Open the valve on the brake bleeder tank.
  8.  
  9. Raise the vehicle and support.
  10.  
  11. Place a proper size wrench over the bleed screw.
  12.  
  13. Attach a clear tube over the screw and allow the tube to hang submerged in a clear container partially filled with brake fluid.
  14.  
  15. Open the bleed screw at least 3 / 4 turn and allow brake fluid flow to continue until no air is seen in the brake fluid.
  16.  
  17. Close the bleed screw.
  18.  
  19. Tighten bleed screws to 115 inch lbs. (13 Nm).
  20.  
  21. Repeat bleeding sequence in the following order:

    Bleed the left front caliper.
     
    Bleed the right front caliper.
     
    Bleed the left rear caliper.
     
    Bleed the right rear caliper.
     

  22.  
  23. Lower the vehicle.
  24.  
  25. Check the brake pedal for sponginess. Repeat the entire bleeding procedure if a low brake pedal or sponginess is found.
    CAUTION
    Do not move the vehicle until a firm brake pedal is obtained. Air in the brake system can cause the loss of brakes with possible personal injury.

  26.  
  27. Remove the brake bleeding equipment from the master cylinder.
  28.  


NOTE
The following procedure requires the use of a Scan Tool. The procedure cycles the system valves and runs the pump in order to purge the air from the secondary circuits normally closed off during normal base brake operation and bleeding. The automated bleed procedure is recommended when air ingestion is suspected in the secondary circuits, or when the BPMV has been replaced.


WARNING
 The Auto Bleed Procedure may be terminated at any time during the process by pressing the EXIT button. No further Scan Tool prompts pertaining to the Auto Bleed procedure will be given. After exiting the bleed procedure, relieve bleed pressure and disconnect bleed equipment per manufacturer-s instructions. Failure to properly relieve pressure may result in spilled brake fluid causing damage to components and painted surfaces.

  1. Raise the vehicle on a suitable support.
  2.  
  3. Remove all four tire and wheel assemblies.
  4.  
  5. Inspect the brake system for leaks and visual damage. Repair or replace as needed.
  6.  
  7. Inspect the battery state of charge.
  8.  
  9. Install a scan tool.
  10.  
  11. Turn the ignition ON , with the engine OFF .
  12.  
  13. With the scan tool, establish communications with the EBCM. Select Special Functions. Select Automated Bleed from the Special Functions menu.
  14.  
  15. Bleed the base brake system.
  16.  
  17. Follow the scan tool directions until the desired brake pedal height is achieved.
  18.  
  19. When the desired pedal height is achieved, press the brake pedal in order to inspect for firmness.
  20.  
  21. Remove the scan tool.
  22.  
  23. Install the tire and wheel assemblies.
  24.  
  25. Inspect the brake fluid level.
  26.  
  27. Road test the vehicle while ensuring that the pedal remains high and firm.
  28.  

Automated Bleed Procedure




NOTE
The following procedure requires the use of a Scan Tool. The procedure cycles the system valves and runs the pump in order to purge the air from the secondary circuits normally closed off during normal base brake operation and bleeding. The automated bleed procedure is recommended when air ingestion is suspected in the secondary circuits, or when the BPMV has been replaced.


WARNING
 The Auto Bleed Procedure may be terminated at any time during the process by pressing the EXIT button. No further Scan Tool prompts pertaining to the Auto Bleed procedure will be given. After exiting the bleed procedure, relieve bleed pressure and disconnect bleed equipment per manufacturer-s instructions. Failure to properly relieve pressure may result in spilled brake fluid causing damage to components and painted surfaces.

  1. Raise the vehicle on a suitable support.
  2.  
  3. Remove all four tire and wheel assemblies.
  4.  
  5. Inspect the brake system for leaks and visual damage. Repair or replace as needed.
  6.  
  7. Inspect the battery state of charge.
  8.  
  9. Install a scan tool.
  10.  
  11. Turn the ignition ON , with the engine OFF .
  12.  
  13. With the scan tool, establish communications with the EBCM. Select Special Functions. Select Automated Bleed from the Special Functions menu.
  14.  
  15. Bleed the base brake system.
  16.  
  17. Follow the scan tool directions until the desired brake pedal height is achieved.
  18.  
  19. When the desired pedal height is achieved, press the brake pedal in order to inspect for firmness.
  20.  
  21. Remove the scan tool.
  22.  
  23. Install the tire and wheel assemblies.
  24.  
  25. Inspect the brake fluid level.
  26.  
  27. Road test the vehicle while inspecting that the pedal remains high and firm.
  28.  

 
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