GM Service Manual Online
For 1990-2009 cars only

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.

Removal Procedure

  1. Disconnect the brake fluid level indicator switch electrical connector.
  2. Disconnect the brake pipes from the master cylinder.
  3. Cap the brake pipe fittings to prevent brake fluid loss and contamination.


    Object Number: 420706  Size: SH
  4. Remove the 2 master cylinder nuts.
  5. Remove the master cylinder.
  6. If installing a new master cylinder, remove the master cylinder reservoir. Refer to Master Cylinder Reservoir Replacement.

Installation Procedure

  1. Install the master cylinder reservoir, if removed. Refer to Master Cylinder Reservoir Replacement.
  2. Bench bleed the master cylinder. Refer to Master Cylinder Bench Bleeding.

  3. Object Number: 420706  Size: SH
  4. Install the master cylinder to the power vacuum brake booster.
  5. Caution: Refer to Fastener Caution in the Preface section.

  6. Install the 2 brake master cylinder nuts and tighten to  27 N·m (20 lb ft).
  7. Install the master cylinder brake pipe fittings and tighten to  29 N·m (21 lb ft).
  8. Connect the electrical connector to the brake fluid level sensor.
  9. Bleed the hydraulic brake system. Refer to Hydraulic Brake System Bleeding.