GM Prizm/Nova 1985-1993 Repair Guide

ABS Manual Bleeding Procedure

Print

See Figures 1 and 2

Brake Control Assembly

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

  1. Clean the master cylinder reservoir and surrounding area.
  2.  
  3. Remove the master cylinder reservoir cap.
  4.  
  5. Inspect the brake fluid level; add clean hydraulic brake fluid GM P/N 1052542, or equivalent DOT 3 brake fluid if needed.
  6.  
  7. Install the master cylinder reservoir cap.
  8.  
  9. Prime hydraulic modulator.
    1. Attach a clear plastic bleed hose to the rearward bleeder valve on the hydraulic modulator. Submerge the other end of the bleeder hose in a clean container partially filled with brake fluid.
    2.  
    3. Slowly open the rearward bleeder valve 1 / 2 to 3 / 4 turn.
    4.  
    5. Have an assistant depress the brake pedal and hold until fluid begins to flow.
    6.  
    7. Close the bleeder valve and release the brake pedal. Repeat Steps B and C until no air bubbles are present. Tighten the bleeder valve to 80 inch lbs. (9 Nm).
    8.  
    9. Repeat procedure for forward bleeder valve.Once fluid is seen to flow from both hydraulic modulator bleeder valves, the hydraulic modulator is sufficiently full of brake fluid. However, it may not be completely purged of air. At this point, move to the wheel cylinders/calipers and bleed them. This ensures that the lowest points in the system are completely free of air and then the hydraulic modulator can be purged of any remaining air.
    10.  

  10.  
  11. Remove the master cylinder reservoir cover and inspect brake fluid level: add hydraulic brake fluid GM P/N 1052542, or equivalent DOT 3 brake fluid, if needed.
  12.  
  13. Install the master cylinder reservoir cover.
  14.  
  15. Raise and suitably support the vehicle.
  16.  

Bleed wheel cylinders/calipers in the following sequence: right rear, left rear, right front, left front.



Click image to see an enlarged view

Fig. Fig. 1: Priming/bleeding the hydraulic modulator



Click image to see an enlarged view

Fig. Fig. 2: Bleeding the wheel cylinder/caliper

  1. Bleed wheel cylinders/calipers in the sequence outlined above.
    1. Attach a clear plastic bleeder hose to the bleeder valve on the wheel cylinder/caliper. Submerge the other end of the bleeder hose in a clean container partially filled with brake fluid.
    2.  
    3. Open the bleeder valve.
    4.  
    5. Have an assistant slowly depress the brake pedal.
    6.  
    7. Close the bleeder valve and release the brake pedal.
    8.  
    9. Wait 5 seconds, then repeat Steps B, C and D (including the 5 second waiting period) until the brake pedal feels firm and no air bubbles are observed in the bleeder hose. Tighten the bleeder valve to 80 inch lbs. (9 Nm).
    10.  
    11. Repeat Steps A through E for the remaining wheel cylinder and calipers.
    12.  

  2.  
  3. Lower the vehicle.
  4.  
  5. Remove the master cylinder reservoir cover and inspect brake fluid level: add hydraulic brake fluid GM P/N 1052542, or equivalent DOT 3 brake fluid, if needed.
  6.  
  7. Install the master cylinder reservoir cover.
  8.  
  9. Bleed the hydraulic modulator.
    1. Attach a clear plastic bleeder hose to the rearward bleeder valve on the hydraulic modulator. Submerge the other end of the bleeder hose in a clean container partially filled with brake fluid.
    2.  
    3. Have an assistant depress the brake pedal with moderate force.
    4.  
    5. Slowly open the rearward bleeder valve 1 / 2 to 3 / 4 turn and allow fluid to flow.
    6.  
    7. Close bleeder valve and release brake pedal.
    8.  
    9. Wait 5 seconds, then repeat Steps B, C and D (including the 5 second waiting period) until all the air is purged from the system. Tighten bleeder valve to 80 inch lbs. (9 Nm).
    10.  
    11. Repeat Steps A through E for the forward bleeder valve.
    12.  

  10.  
  11. Remove the master cylinder reservoir cover and inspect brake fluid level: add hydraulic brake fluid GM P/N 1052542, or equivalent DOT 3 brake fluid, if needed.
  12.  
  13. Install master cylinder reservoir cover.
  14.  

Inspect: With the ignition switch in ON , depress the brake pedal with moderate force and hold in position. Note pedal travel and feel.

If pedal feels firm and constant and pedal travel is not excessive, start the engine. With the engine running, re-check the pedal travel. If it is still firm and constant and pedal travel is not excessive, proceed with Step 16.

If pedal feels soft or has excessive travel either initially or after engine start, using the TECH 1, Release then Apply the motors three times and cycle the solenoids 10 times. Be sure to Apply the motors to ensure that the pistons are in the home position. Repeat the bleeding procedure.

  1. Road test the vehicle. Make several normal (non ABS) stops from a moderate speed to ensure proper brake system function.
  2.  

 
label.common.footer.alt.autozoneLogo