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Home >> Hummer >> 2009 >> H2 4D Utility Pickup >> Repair and Diagnosis >> Brakes >> Traction Control >> Antilock Brake System >> Repair Instructions >> Brake Master Cylinder with Power Brake Booster and Chassis Control Module Replacement >> Removal Procedure

Removal Procedure

WARNING: Refer to Brake Fluid Irritant Warning .
  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.
    Fig 1: Identifying Rear Brake Pipes
    GM1977729Courtesy of GENERAL MOTORS CORP.
  3. Remove the 2 rear brake pipes (1) from the brake master cylinder.

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

  4. NOTE: Reference mark the brake pipe location for correct installation.
    Fig 2: Identifying Front Brake Pipes
    GM1977730Courtesy of GENERAL MOTORS CORP.
  5. Remove the 2 front brake pipes (1) from the brake master cylinder.

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

  6. Disconnect the electrical connectors at the brake pressure modulator valve (BPMV).
  7. Disconnect the brake fluid level sensor electrical connector.
  8. Fig 3: Identifying Brake Master Cylinder Pushrod Retainer Bolt
    GM1977731Courtesy of GENERAL MOTORS CORP.
  9. Remove the brake master cylinder pushrod retainer bolt (1).
  10. Fig 4: Identifying Brake Master Cylinder Pushrod Retainer
    GM1977732Courtesy of GENERAL MOTORS CORP.
  11. Remove the brake master cylinder pushrod retainer (1).
  12. Fig 5: Identifying Stoplamp Switch
    GM1977733Courtesy of GENERAL MOTORS CORP.
  13. Simultaneously remove the brake master cylinder pushrod and the stoplamp switch (1) from the brake pedal clevis pin.
  14. 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.
    Fig 6: Identifying Brake Master Cylinder Nuts
    GM1977734Courtesy of GENERAL MOTORS CORP.
  15. Remove the brake master cylinder nuts (1).
  16. Fig 7: Identifying Brake Master Cylinder And Power Brake Booster Assembly
    GM1977735Courtesy of GENERAL MOTORS CORP.
  17. Remove the brake master cylinder and power brake booster assembly (1).