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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 >> Brake Master Cylinder Reservoir Hose Replacement >> 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 until the level is below the reservoir supply hose fitting 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).
  6. Disconnect the brake master cylinder reservoir supply hose quick connect (2).
  7. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
    8. Fig 2: ABS Module Splash Shield Retainers
    GM1965624Courtesy of GENERAL MOTORS CORP.
  8. Remove the antilock brake system (ABS) module splash shield retainers (1).
    9. Fig 3: ABS Module Splash Shield Bolts
    GM1965625Courtesy of GENERAL MOTORS CORP.
  9. Remove the ABS module splash shield bolts (1).
    10. Fig 4: ABS Module Splash Shield
    GM1965627Courtesy of GENERAL MOTORS CORP.
  10. Remove the ABS module splash shield (1).
  11. Clean all dirt and debris from the brake pressure modulator valve (BPMV) assembly and the brake hose fittings.
    12. Fig 5: BPMV Supply Hose Quick Connect
    GM1965631Courtesy of GENERAL MOTORS CORP.
  12. Disconnect the BPMV supply hose quick connect (1).

    Cap the BPMV inlet port and plug the supply hose to prevent brake fluid loss and contamination.

    13. Fig 6: BPMV Return Hose Quick Connect
    GM1965632Courtesy of GENERAL MOTORS CORP.
  13. Disconnect the BPMV return hose quick connect (1).

    Cap the BPMV outlet port and plug the return hose to prevent brake fluid loss and contamination.

  14. Release the supply and return hoses from the retainers and remove the hoses from the vehicle.
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