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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brakes >> Repair Instructions >> Power Brake Booster Replacement >> Removal Procedure

Removal Procedure

    Fig 1: Identifying Brake Master Cylinder And Power Brake Booster Assembly
    GM1977780Courtesy of GENERAL MOTORS CORP.
  1. Remove the brake master cylinder and power brake booster assembly. Refer to Brake Master Cylinder with Power Brake Booster and Chassis Control Module Replacement .
  2. Install the CH-47830  (1) to the master cylinder assembly.
  3. Position the CH-47830  with the master cylinder assembly in a vise.
  4. Remove the hydraulic brake booster accumulator. Refer to Hydraulic Brake Booster Accumulator Replacement .
  5. Remove the power brake booster inlet hose. Refer to Power Brake Booster Inlet Hose Replacement .
  6. Remove the power brake booster outlet front pipe. Refer to Power Brake Booster Outlet Front Pipe Replacement .
    7. IMPORTANT: Note the location of the black negative wire and the red positive wire. The black negative wire is toward the front of the vehicle. The red positive wire is toward the rear of the vehicle.
    Fig 2: Identifying Black Negative Wire Terminal Plug And Screw
    GM1977961Courtesy of GENERAL MOTORS CORP.
  7. Remove the black negative wire terminal plug (1) and the screw.
  8. Remove the red positive wire terminal plug (2) and the screw.
  9. Disconnect the pump motor wire harness from the brake pressure modulator valve (BPMV) module.
    10. Fig 3: View Of Power Brake Booster Pump Bracket Bolts
    GM1977965Courtesy of GENERAL MOTORS CORP.
  10. Remove the power brake booster pump bracket bolts (1).
    11. Fig 4: View Of Power Brake Booster Pump
    GM1977966Courtesy of GENERAL MOTORS CORP.
  11. Remove the power brake booster pump (1).
    12. Fig 5: Identifying Power Brake Booster Pump Damper Retaining Ring
    GM1977968Courtesy of GENERAL MOTORS CORP.
  12. Remove the power brake booster pump damper retaining ring (1) by breaking and discarding the retaining ring.
  13. Remove the power brake booster pump damper (2) and the bracket (3).
    14. Fig 6: Identifying Power Brake Booster Pump Motor Dampers
    GM1977969Courtesy of GENERAL MOTORS CORP.
  14. Remove the power brake booster pump motor dampers (1).
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