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Removal Procedure

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  1. Place the transmission in the PARK or NEUTRAL position.
  2. Apply the park brake.
    3. 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.

  3. Turn the ignition to OFF, without pausing at ACCESSORY, and without applying the brake pedal.

    Remove the ignition key.

  4. Wait approximately 1 to 3 minutes until the brake modulator and HPA pressure relief is complete.
    5. Fig 1: Master Cylinder Nuts
    GM1966259Courtesy of GENERAL MOTORS CORP.
  5. Remove the master cylinder nuts (1).

    Discard the master cylinder nuts.

    6. Fig 2: Master Cylinder
    GM1966261Courtesy of GENERAL MOTORS CORP.
  6. Without disconnecting the brake pipes, release and carefully position aside the master cylinder (1).

    Support the master cylinder with heavy mechanics wire or equivalent.

    7. Fig 3: Brake Master Cylinder And Master Cylinder Seal
    GM1892241Courtesy of GENERAL MOTORS CORP.
  7. Inspect the master cylinder seal (1) for damage and replace, if necessary.
  8. Disconnect the brake master cylinder (BMC) primary piston position sensor electrical connector.
    9. Fig 4: Brake Pushrod Retainer Bolt
    GM1892248Courtesy of GENERAL MOTORS CORP.
  9. Remove the brake pushrod retainer bolt (1), if equipped.
    10. Fig 5: Brake Pushrod Retainer
    GM1892250Courtesy of GENERAL MOTORS CORP.
  10. Remove the brake pushrod retainer (1).
    11. Fig 6: Stoplamp (Brake Light) Switch
    GM1892252Courtesy of GENERAL MOTORS CORP.
  11. Slide the stoplamp switch (1) off of the brake pedal pushrod pin while simultaneously disconnecting the brake pushrod.
    12. Fig 7: Brake Booster Nuts
    GM1892257Courtesy of GENERAL MOTORS CORP.
  12. Remove the 4 brake pedal bracket nuts (1).
    13. Fig 8: Brake Master Cylinder Adapter
    GM1966263Courtesy of GENERAL MOTORS CORP.
  13. Remove the brake master cylinder adapter (1).
  14. Inspect the master cylinder adapter gasket for damage and replace, if necessary.
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