GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Warning: Refer to Brake Fluid Irritant Warning in the Preface section.

Caution: Refer to Brake Fluid Effects on Paint and Electrical Components Caution in the Preface section.

  1. Apply and release the brake pedal 20 times to deplete the hydraulic brake booster accumulator reserve.
  2. Note: Reference mark the brake pipe location for correct installation.


    Object Number: 1977729  Size: SH
  3. Remove the 2 rear brake pipes (1) from the brake master cylinder.
  4. Cap the brake pipe fittings and plug the master cylinder outlet ports to prevent brake fluid loss and contamination.

    Note: Reference mark the brake pipe location for correct installation.


    Object Number: 1977730  Size: SH
  5. Remove the 2 front brake pipes (1) from the brake master cylinder.
  6. Cap the brake pipe fittings and plug the master cylinder outlet ports to prevent brake fluid loss and contamination.

  7. Disconnect the electrical connectors at the brake pressure modulator valve (BPMV).
  8. Disconnect the brake fluid level sensor electrical connector.

  9. Object Number: 1977731  Size: SH
  10. Remove the brake master cylinder pushrod retainer bolt (1).

  11. Object Number: 1977732  Size: SH
  12. Remove the brake master cylinder pushrod retainer (1).

  13. Object Number: 1977733  Size: SH
  14. Simultaneously remove the brake master cylinder pushrod and the stoplamp switch (1) from the brake pedal clevis pin.
  15. Note: It may be necessary to reposition or remove some of the wiring harnesses from their retainers to provide clearance to remove the brake master cylinder nuts.


    Object Number: 1977734  Size: SH
  16. Remove the brake master cylinder nuts (1).

  17. Object Number: 1977735  Size: SH
  18. Remove the brake master cylinder and power brake booster assembly (1).

Installation Procedure


    Object Number: 1977735  Size: SH
  1. Install the brake master cylinder and power brake booster assembly (1).
  2. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1977734  Size: SH
  3. Install the brake master cylinder nuts (1).
  4. Tighten
    Tighten the nuts to 36 N·m (27 lb ft).

  5. Position the wiring harnesses to the retainers, if removed.

  6. Object Number: 1977733  Size: SH
  7. Simultaneously install the brake master cylinder pushrod and the stoplamp switch (1) to the brake pedal clevis pin.

  8. Object Number: 1977732  Size: SH
  9. Install the brake master cylinder pushrod retainer (1).

  10. Object Number: 1977731  Size: SH
  11. Install the brake master cylinder pushrod retainer bolt (1).
  12. Tighten
    Tighten the bolt to 10 N·m (89 lb in).


    Object Number: 1977730  Size: SH
  13. Install the 2 front brake pipes (1) to the brake master cylinder.
  14. Tighten
    Tighten the fittings to 25 N·m (18 lb ft).

  15. Connect the electrical connectors at the brake pressure modulator valve (BPMV).
  16. Connect the brake fluid level sensor electrical connector.

  17. Object Number: 1977729  Size: SH
  18. Install the 2 rear brake pipes (1) to the brake master cylinder.
  19. Tighten
    Tighten the fittings to 25 N·m (18 lb ft).

  20. Bleed the hydraulic brake system. Refer to Hydraulic Brake System Bleeding.