GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

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

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

  1. Using a suitable tool, remove the brake fluid from the brake master cylinder reservoir.
  2. Discard the brake fluid into an approved container.
  3. Remove the underhood electrical center. Refer to Underhood Electrical Center or Junction Block Replacement .
  4. Without draining the coolant or removing the hoses, remove and position aside the radiator surge tank. Refer to Radiator Surge Tank Replacement .

  5. Object Number: 1874781  Size: SH
  6. Disconnect the master cylinder fluid level sensor electrical connector (1).
  7. Disconnect the master cylinder primary brake pipe fitting (2).
  8. Cap the brake pipe fitting and plug the master cylinder outlet port to prevent brake fluid loss and contamination.

  9. Disconnect the master cylinder secondary brake pipe fitting (3).
  10. Cap the brake pipe fitting and plug the master cylinder outlet port to prevent brake fluid loss and contamination.


    Object Number: 1874782  Size: SH
  11. Remove the 2 master cylinder nuts (1).
  12. Remove the master cylinder (2).

Installation Procedure

  1. If installing a new master cylinder, bench bleed the master cylinder. Refer to Master Cylinder Bench Bleeding .

  2. Object Number: 1874782  Size: SH
  3. Install the master cylinder (2).
  4. Notice: Refer to Fastener Notice in the Preface section.

  5. Install the 2 master cylinder nuts (1).
  6. Tighten
    Tighten the nuts to 25 N·m (18 lb ft).


    Object Number: 1874781  Size: SH
  7. Connect the master cylinder fluid level sensor electrical connector (1).
  8. Connect the master cylinder primary brake pipe fitting (2).
  9. Tighten
    Tighten the fitting to 18 N·m (13 lb ft).

  10. Connect the master cylinder secondary brake pipe fitting (3).
  11. Tighten
    Tighten the fitting to 18 N·m (13 lb ft).

  12. Install the radiator surge tank. Refer to Radiator Surge Tank Replacement .
  13. Install the underhood electrical center. Refer to Underhood Electrical Center or Junction Block Replacement .
  14. Bleed the hydraulic brake system. Refer to Hydraulic Brake System Bleeding .