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Home >> GMC >> 2022 >> Hummer EV >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brakes >> Repair Instructions >> Brake Master Cylinder Replacement - With Power Brake Booster and Electronic Brake Control Module >> Removal Procedure

Removal Procedure

  1. Disconnect the battery negative cable. Battery Negative Cable Disconnection and Connection
  2. GM5835307Courtesy of GENERAL MOTORS COMPANY

    Brake Pedal Push Rod Bolt (1) - Remove

  3. Brake Pedal Nut (2) - Remove [4x]
  4. GM5787985Courtesy of GENERAL MOTORS COMPANY

    Turn the 3 front compartment sight shield retainers (1) a quarter turn counter clockwise to release.

  5. GM5787987Courtesy of GENERAL MOTORS COMPANY

    Front Compartment Side Sight Shield (1) - Remove

  6. Thoroughly clean the brake master cylinder reservoir and the brake master cylinder body to remove any dirt and debris.
  7. Electrical Connector @ Brake System Control Module - Disconnect
  8. Electrical Connector @ Brake Fluid Level Indicator Switch - Disconnect
  9. Place a drain pan under the vehicle.
  10. GM5835315Courtesy of GENERAL MOTORS COMPANY

    Brake Master Cylinder Bolt (1) - Remove [2x]

  11. GM5835316Courtesy of GENERAL MOTORS COMPANY

    Brake Master Cylinder Reservoir (1) - Remove

  12. Brake Master Cylinder Reservoir Seal (2) - Remove and DISCARD [3x]
  13. GM5835311Courtesy of GENERAL MOTORS COMPANY

    Remove the 4 rear brake front pipe nuts (1) and position the brake pipes aside.

  14. GM5835308Courtesy of GENERAL MOTORS COMPANY

    Brake Master Cylinder Adapter Nut (1) - Remove

  15. GM5835312Courtesy of GENERAL MOTORS COMPANY

    Maneuver the brake master cylinder (1) out of the vehicle.

  16. Brake Master Cylinder Gasket (2) - Remove and DISCARD
  17. Clean any brake fluid from the underbody area and remove the drain pan from under the vehicle.