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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 209 (Anti-Lock Brake System - Hybrid) >> Repair Instructions >> Brake Pressure Modulator Valve Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: The high pressure accumulator (HPA) and the chambers of the brake modulator assembly to which it attaches, store brake fluid at extremely high pressures. Fluid pressure must be relieved before attempting to service the HPA. Ensure that the recommended procedures are followed to relieve system pressure, including using the manual pressure release steps. Failure to properly follow procedures to depressurize the system may result in personal injury. 
CAUTION: Refer to Brake Fluid Irritant Caution .
NOTE: Refer to Brake Fluid Effects on Paint and Electrical Components Notice .
NOTE: Always connect or disconnect the wiring harness connector from the EBCM/EBTCM with the ignition switch in the OFF position. Failure to observe this precaution could result in damage to the EBCM/EBTCM.
IMPORTANT: 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 1-3 minutes.
  1. Turn the ignition to OFF, without pausing at ACCESSORY, and without applying the brake pedal.

    Remove the ignition key.

  2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
    3. Fig 1: View Of ABS Module Splash Shield Retainers
    GM1965624Courtesy of GENERAL MOTORS CORP.
  3. Remove the antilock brake system (ABS) module splash shield retainers (1).
    4. Fig 2: View Of ABS Module Splash Shield Bolts
    GM1965625Courtesy of GENERAL MOTORS CORP.
  4. Remove the ABS module splash shield bolts (1).
    5. Fig 3: View Of ABS Module Splash Shield
    GM1965627Courtesy of GENERAL MOTORS CORP.
  5. Remove the ABS module splash shield (1).
  6. Clean all dirt and debris from the brake pressure modulator valve (BPMV) assembly and the brake pipe fittings.
    7. Fig 4: View Of Brake Modulator Manual Pressure Relief Valve
    GM2037952Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: To ensure brake modulator and HPA pressure relief has occurred, the manual pressure relief valve must be opened momentarily.
  7. Loosen the brake modulator manual pressure relief valve (1) 1/4 turn counterclockwise.
  8. Seat, but do not tighten, the manual pressure relief valve.
    9. Fig 5: View Of BPMV Supply Hose Quick Connect
    GM1965631Courtesy of GENERAL MOTORS CORP.
  9. Disconnect the electronic brake control module (EBCM) electrical connector.
  10. Disconnect the electronic brake control position sensor electrical connector.
  11. 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.

    12. Fig 6: View Of BPMV Return Hose Quick Connect
    GM1965632Courtesy of GENERAL MOTORS CORP.
  12. 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.

    13. Fig 7: View Of RR Brake Pipe Fitting
    GM1965634Courtesy of GENERAL MOTORS CORP.
  13. Disconnect the RR brake pipe fitting (1).

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

    14. Fig 8: View Of LR Brake Pipe Fitting
    GM1965636Courtesy of GENERAL MOTORS CORP.
  14. Disconnect the LR brake pipe fitting (1).

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

    15. Fig 9: View Of Primary Brake Pipe Fitting
    GM1965637Courtesy of GENERAL MOTORS CORP.
  15. Disconnect the primary brake pipe fitting (1).

    Cap the brake pipe fitting and plug the BPMV inlet port to prevent brake fluid loss and contamination.

    16. Fig 10: View Of RH Supply Brake Pipe Fitting
    GM1965640Courtesy of GENERAL MOTORS CORP.
  16. Disconnect the RH supply brake pipe fitting (1).

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

    17. Fig 11: View Of LH Supply Brake Pipe Fitting
    GM1965641Courtesy of GENERAL MOTORS CORP.
  17. Disconnect the LH supply brake pipe fitting (1).

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

    18. Fig 12: Locating BPMV Bracket Bolts
    GM1965643Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: It is not necessary to remove the BPMV bracket bolts.
  18. From the outboard of the vehicle frame, access and loosen the 3 BPMV bracket bolts (1).
    19. Fig 13: View Of EBCM/BPMV & Bracket Assembly
    GM1965644Courtesy of GENERAL MOTORS CORP.
  19. Slide the EBCM/BPMV and bracket assembly (1) toward the front of the vehicle and remove the assembly from the vehicle frame.
  20. Place the EBCM/BPMV and bracket assembly on a clean work surface.
    21. Fig 14: View Of BPMV Bolts
    GM1965646Courtesy of GENERAL MOTORS CORP.
  21. Remove the 2 BPMV bolts (1).
    22. Fig 15: View Of BPMV Bracket
    GM1965647Courtesy of GENERAL MOTORS CORP.
  22. Remove the BPMV assembly from the bracket (1).
  23. Remove the sleeves and insulators from the BPMV, if necessary.
    24. Fig 16: View Of EBCM Bolts
    GM2077050Courtesy of GENERAL MOTORS CORP.
  24. If replacing the BPMV, loosen but do not remove the EBCM bolts (1).
    25. Fig 17: View Of EBCM
    GM2077051Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Do not pry the EBCM from the BPMV. The EBCM must be pulled back evenly.
  25. Using the loosened bolts as a guide, carefully pull the EBCM (1) evenly from the BPMV to release the electrical connectors.
    26. Fig 18: View Of EBCM Bolts
    GM2077054Courtesy of GENERAL MOTORS CORP.
  26. Remove the EBCM bolts (1).
    27. Fig 19: View Of EBCM
    GM2077055Courtesy of GENERAL MOTORS CORP.
  27. Remove the EBCM (1).
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