LEMON Manuals: Even more car manuals for everyone
Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 477 (Hydraulic Brake System) >> Repair Instructions >> Master Cylinder Replacement (Two-mode Hybrid) >> Removal Procedure

Removal Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:

Refer to Brake Fluid Irritant Warning .

    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.

  3. Wait approximately 1 to 3 minutes until the brake modulator and HPA pressure relief is complete.
  4. Remove the brake fluid from the brake master cylinder reservoir and discard into an approved container.
  5. Disconnect the brake fluid level sensor electrical connector.
  6. Fig 1: View Of Brake Master Cylinder Reservoir Return Hose Quick Connect & Supply Hose Quick Connect
    GM1892190Courtesy of GENERAL MOTORS COMPANY
  7. Disconnect the brake master cylinder reservoir return hose quick connect (1) and position the hose aside.
  8. Disconnect the brake master cylinder reservoir supply hose quick connect (2) and position the hose aside.
  9. Fig 2: Brake Master Cylinder Primary Brake Pipe Fitting
    GM1892200Courtesy of GENERAL MOTORS COMPANY
  10. 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.

  11. Fig 3: Brake Master Cylinder Left Supply Brake Pipe Fitting
    GM1892202Courtesy of GENERAL MOTORS COMPANY
  12. 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.

  13. Fig 4: Brake Master Cylinder Right Supply Brake Pipe Fitting
    GM1892213Courtesy of GENERAL MOTORS COMPANY
  14. 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.

  15. Fig 5: Brake Master Cylinder Right Front Brake Pipe Fitting
    GM1892216Courtesy of GENERAL MOTORS COMPANY
  16. 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.

  17. Fig 6: Brake Master Cylinder Left Front Brake Pipe Fitting
    GM1892220Courtesy of GENERAL MOTORS COMPANY
  18. 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.

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

    Discard the brake master cylinder nuts.

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