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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 333 (Hydraulic Brake System) >> Repair Instructions >> Master Cylinder Replacement (Two-mode Hybrid) >> Removal Procedure

Removal Procedure

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WARNING:

Refer to Brake Fluid Irritant Warning .

CAUTION:

Refer to Brake Fluid Effects on Paint and Electrical Components Caution .

    NOTE:

    The ignition must be in the OFF position, without pausing at ACCESSORY, and without applying the brake pedal to ensure the brake modulator and high pressure accumulator (HPA) pressure relief occurs. This process will take approximately 1 to 3 minutes.

  1. Turn the ignition to OFF, without pausing at ACCESSORY, and remove the ignition key.
    2. NOTE:

    During the pressure relief process, the fluid level in the master cylinder reservoir will rise. Do not remove the master cylinder reservoir cap during the pressure relief process.

  2. Wait approximately 1 to 3 minutes until the brake modulator and HPA pressure relief is complete.
  3. Remove the brake fluid from the brake master cylinder reservoir and discard into an approved container.
  4. Disconnect the brake fluid level sensor electrical connector.
    5. Fig 1: Reservoir Return Hose Quick Connect
    GM1892190Courtesy of GENERAL MOTORS CORP.
  5. Disconnect the brake master cylinder reservoir return hose quick connect (1) and position the hose aside.
  6. Disconnect the brake master cylinder reservoir supply hose quick connect (2) and position the hose aside.
    7. Fig 2: Brake Master Cylinder Primary Brake Pipe Fitting
    GM1892200Courtesy of GENERAL MOTORS CORP.
  7. Disconnect the brake master cylinder primary brake pipe fitting (1).

    Cap the brake pipe fitting and plug the master cylinder outlet port to prevent brake fluid loss and contamination.

    8. Fig 3: Brake Master Cylinder Left Supply Brake Pipe Fitting
    GM1892202Courtesy of GENERAL MOTORS CORP.
  8. Disconnect the brake master cylinder left supply brake pipe fitting (1).

    Cap the brake pipe fitting and plug the master cylinder outlet port to prevent brake fluid loss and contamination.

    9. Fig 4: Brake Master Cylinder Right Supply Brake Pipe Fitting
    GM1892213Courtesy of GENERAL MOTORS CORP.
  9. Disconnect the brake master cylinder right supply brake pipe fitting (1).

    Cap the brake pipe fitting and plug the master cylinder outlet port to prevent brake fluid loss and contamination.

    10. Fig 5: Brake Master Cylinder Right Front Brake Pipe Fitting
    GM1892216Courtesy of GENERAL MOTORS CORP.
  10. Disconnect the brake master cylinder right front brake pipe fitting (1).

    Cap the brake pipe fitting and plug the master cylinder outlet port to prevent brake fluid loss and contamination.

    11. Fig 6: Brake Master Cylinder Left Front Brake Pipe Fitting
    GM1892220Courtesy of GENERAL MOTORS CORP.
  11. Disconnect the brake master cylinder left front brake pipe fitting (1).

    Cap the brake pipe fitting and plug the master cylinder outlet port to prevent brake fluid loss and contamination.

    12. Fig 7: Brake Master Cylinder Nuts
    GM1892240Courtesy of GENERAL MOTORS CORP.
  12. Remove the brake master cylinder nuts (1).

    Discard the brake master cylinder nuts.

    13. Fig 8: Brake Master Cylinder And Master Cylinder Seal
    GM1892241Courtesy of GENERAL MOTORS CORP.
  13. Remove the brake master cylinder and the master cylinder seal (1).
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