GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 HUMMER 🢒 2006 🢒 H3 🢒 Brakes 🢒 Antilock Brake System 🢒 Brake Master Cylinder with Power Brake Booster and Chassis Control Module Replacement

Removal Procedure

    Important: 

       • In the following service procedure, plug the brake pipes to avoid dirt or any type of contaminates to enter the brake system.
       • Depress the brake pedal 20 times to release accumulator pressure.


    Object Number: 1622076 Size: SH
  1. Disconnect the rear and left front brake pipes from the brake master cylinder.

    2. Object Number: 1622075 Size: SH
  2. Disconnect the right front brake pipe from the brake master cylinder.
  3. Disconnect the electrical connectors at the brake pressure modulator valve (BPMV).
  4. Disconnect the electrical connector for the fluid level sensor.
  5. Remove the knee bolster panel. Refer to Driver Knee Bolster Replacement .
  6. Remove the knee bolster bracket. Refer to Driver Knee Bolster Bracket Replacement .

    7. Object Number: 1622088 Size: SH
  7. Remove the clevis pin retainer from the clevis pin.
  8. Remove the clevis pin from the master cylinder push rod.

    9. 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.


    Object Number: 1622072 Size: SH

    Important: It maybe necessary to relocate or remove some of the wiring harness from their retainers to gain enough clearance to remove the mounting nuts for the brake master and or the brake master cylinder itself.

  9. Remove the mounting nuts for the brake master cylinder (2).
  10. Remove the brake master cylinder assembly (1).

Installation Procedure

    Object Number: 1622072 Size: SH
  1. Install the brake master cylinder assembly (1) in the mounting holes.

    2. Notice: Refer to Fastener Notice in the Preface section.

  2. Install the mounting nuts for the brake master cylinder (2).

    3. Tighten
    Tighten the brake master cylinder nuts to 30 N·m (22 lb ft).


    Object Number: 1622088 Size: SH
  3. Install the clevis pin in the master cylinder push rod.
  4. Install the clevis pin retainer from the clevis pin.
  5. Install the knee bolster bracket. Refer to Driver Knee Bolster Bracket Replacement .
  6. Install the knee bolster panel. Refer to Driver Knee Bolster Replacement .
  7. Connect the electrical connector for the fluid level sensor.
  8. Connect the electrical connectors at the BPMV.

    9. Object Number: 1622075 Size: SH
  9. Connect the right front brake pipe to the brake master cylinder.

    10. Tighten
    Tighten the brake master cylinder fittings to 19 N·m (14 lb ft).


    Object Number: 1622076 Size: SH
  10. Connect the rear and left front brake pipes to the brake master cylinder.

    11. Tighten
    Tighten the brake master cylinder fittings to 19 N·m (14 lb ft).

  11. Adjust the stop lamp switch. Refer to Stop Lamp Switch Adjustment .
  12. Bleed the brake system. Refer to Hydraulic Brake System Bleeding .