GM Corsica/Beretta 1988-1996 Repair Guide

Bleeding the ABS System

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Brake Control Assembly

Only use brake fluid from a sealed container which meets DOT 3 specifications.

  1. Clean the area around the master cylinder cap.
  2.  
  3. Check fluid level in master cylinder reservoir and top-up, as necessary. Check fluid level frequently during bleeding procedure.
  4.  
  5. Attach a bleeder hose to the rear bleeder valve on the brake control assembly. Slowly open the bleeder valve.
  6.  
  7. Depress the brake pedal slowly until fluid begins to flow.
  8.  
  9. Close the valve and release the brake pedal.
  10.  
  11. Repeat for the front bleeder valve on the brake control assembly.
  12.  

When fluid flows from both bleeder valves, the brake control assembly is sufficiently full of fluid. However, it may not be completely purged of air. Bleed the individual wheel calipers/cylinders and return to the control assembly to purge the remaining air.

Wheel Calipers/Cylinders

Prior to bleeding the rear brakes, the rear displacement cylinder must be returned to the top-most position. This can be accomplished using the Tech I Scan tool or T-100 (CAMS), by entering the manual control function and applying the rear motor.

If a Tech I or T-100 are unavailable, bleed the front brakes. Ensure the pedal is firm. Carefully drive the vehicle to a speed above 4 mph to cause the ABS system to initialize. This will return the rear displacement cylinder to the top-most position.

  1. Clean the area around the master cylinder cap.
  2.  
  3. Check fluid level in master cylinder reservoir and top-up, as necessary. Check fluid level frequently during bleeding procedure.
  4.  
  5. Raise and safely support the vehicle.
  6.  
  7. Attach a bleeder hose to the bleeder valve of the right rear wheel and submerge the opposite hose in a clean container partially filled with brake fluid.
  8.  
  9. Open the bleeder valve.
  10.  
  11. Slowly depress the brake pedal.
  12.  
  13. Close the bleeder valve and release the brake pedal.
  14.  
  15. Wait 5 seconds.
  16.  
  17. Repeat Steps 5-8 until the pedal begins to feel firm and no air bubbles appear in the bleeder hose.
  18.  
  19. Repeat Steps 5-9, until the pedal is firm and no air bubbles appear in the brake hose, for the remaining wheels in the following order:
    1. left rear
    2.  
    3. right front
    4.  
    5. left front.
    6.  

  20.  
  21. Lower the vehicle.
  22.  

 
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