GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2009 🢒 Allure 🢒 Brakes 🢒 Hydraulic Brakes 🢒 Master Cylinder Replacement

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.


    Object Number: 177372 Size: SH
  1. Disconnect the electrical connector from the brake fluid level sensor.
  2. Disconnect the brake pipe fittings from the master cylinder.

    3. Cap the brake pipe fittings and plug the master cylinder outlet ports to prevent brake fluid loss and contamination.

  3. Remove master cylinder mounting nuts.
  4. Remove the master cylinder from the vehicle.
  5. Remove the brake fluid from the master cylinder reservoir.

Installation Procedure

    Object Number: 177372 Size: SH
  1. Bench bleed the master cylinder. Refer to Master Cylinder Bench Bleeding.
  2. Install the master cylinder to the vacuum brake booster.

    3. Caution: Refer to Fastener Caution in the Preface section.

  3. Install the master cylinder mounting nuts and tighten to 33 N·m (24 lb ft).
  4. Connect the brake pipe fittings to the master cylinder and tighten the fittings to 30 N·m (22 lb ft).
  5. Connect the brake fluid level sensor electrical connector.
  6. Bleed the hydraulic brake system. Refer to Hydraulic Brake System Bleeding.