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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 118 (Hydraulic Brake System) >> Repair Instructions >> Vacuum Brake Booster Replacement >> Removal Procedure

Removal Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Refer to Brake Fluid Irritant Caution .
NOTE: Refer to Brake Fluid Effects on Paint and Electrical Components Notice .
  1. Apply the park brake.
  2. Deplete the vacuum reserve in the vacuum booster by applying the brake pedal 3 times or until the pedal becomes firm.
    3. Fig 1: View Of DOD Sensor, Booster Connector & Check Valve
    GM1704907Courtesy of GENERAL MOTORS CORP.
  3. Remove the electrical connectors for the DOD sensor (1) and the active booster connector (2).
  4. Remove the vacuum hose from the check valve (3).
  5. Remove the 2 master cylinder nuts.
    6. IMPORTANT:
    • It is not necessary to disconnect the brake pipes from the master cylinder.
    • Ensure the O-ring vacuum seal is on the master cylinder after removal.
  6. Position the master cylinder aside and secure with heavy mechanics wire or equivalent.
    7. Fig 2: View Of Pedal Stud, Stop Lamp Switch, Pushrod & Retaining Clip
    GM344194Courtesy of GENERAL MOTORS CORP.
  7. Remove the retaining clip (4) for the pushrod (1).
  8. Remove the stop lamp switch (2) and the pushrod (3) from the brake pedal (1).
    9. Fig 3: Identifying Vacuum Booster & Nuts
    GM344197Courtesy of GENERAL MOTORS CORP.
  9. Remove the brake booster mounting nuts.
  10. Remove the brake booster.
  11. Remove and discard the brake booster gasket.
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