GM Celebrity/Century/Ciera/6000 1982-1996 Repair Guide

Filling and Bleeding

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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



See Figure 1

  1. 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 equivalent, by entering the manual control function and applying the rear motor. If a scan tool is 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.
  2.  



Click image to see an enlarged view

Fig. Fig. 1: The Tech I scan tool or equivalent can be used to position the rear displacement cylinder

  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 until the pedal begins to feel firm and no air bubbles appear in the bleeder hose.
  18.  
  19. Bleed the remaining wheels in the following order:

    left rear
     
    right front
     
    left front
     

  20.  
  21. Lower the vehicle.
  22.  

 
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