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Home >> Buick >> 2021 >> Enclave Premium, FWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brakes >> Repair Instructions >> Power Brake Booster Replacement >> Removal Procedure

Removal Procedure

  1. Place the ignition switch in the OFF position.
  2. Apply and release the brake pedal several times until the brake pedal becomes firm to deplete the power brake booster vacuum reserve.
  3. Without disconnecting the hoses, remove and position aside the radiator surge tank. Radiator Surge Tank Replacement
  4. Power Brake Booster Vacuum Sensor Electrical Connector - Disconnect
  5. GM4285121Courtesy of GENERAL MOTORS COMPANY

    Power Brake Booster Vacuum Sensor (1) - Remove

  6. Disconnect the brake fluid level indicator switch electrical connector.
  7. GM4285064Courtesy of GENERAL MOTORS COMPANY

    Brake Master Cylinder Nut (1) - Remove and DISCARD [ 2x ]

  8. Without disconnecting the brake pipes, carefully remove and position aside the master cylinder.
  9. GM4325955Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Do NOT disconnect the heater coolant pump hoses.

    { If equipped } Heater Coolant Pump Stud (1) - Remove - Heater Coolant Pump Replacement

  10. Position the heater coolant pump and hoses aside.
  11. GM4419511Courtesy of GENERAL MOTORS COMPANY

    Fuel Injector Wiring Harness Retainer (1) - Release

  12. GM4285076Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Do NOT loosen the power brake booster bolts completely.

    Power Brake Booster Bolt (1) - Loosen [ 2x ]

  13. Brake Pedal Position Sensor - Remove - Brake Pedal Position Sensor Replacement
  14. With the aid of an assistant, hold the power brake booster away from the dash panel.
  15. GM4285082Courtesy of GENERAL MOTORS COMPANY

    Brake Pedal Retainer (1) - Release

  16. NOTE:

    Pull the brake pedal rearward to release.

  17. Brake Pedal (2) - Release
  18. Completely loosen the 2 power brake booster bolts.
  19. GM4285079Courtesy of GENERAL MOTORS COMPANY

    Power Brake Booster (1) - Remove

  20. GM4285081Courtesy of GENERAL MOTORS COMPANY

    Power Brake Booster Seal (1) - Inspect for damage

  21. Replace the power brake booster seal if damaged.
  22. GM4285112Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Insert a long, thin tool through the power brake booster pass-through from the engine compartment to remove the brake pedal retainer.

    Brake Pedal Retainer (1) - Remove and DISCARD