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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brake System >> Repair Instructions >> Power Vacuum Brake Booster Replacement >> Removal Procedure

Removal Procedure

  1. With the engine OFF, apply and release the brake pedal several times until the pedal becomes firm to deplete the power vacuum brake booster vacuum reserve.
  2. Without draining the coolant and without disconnecting the hoses, remove and position aside the radiator surge tank. Refer to Radiator Surge Tank Replacement (LEA, LUK) .
  3. Disconnect the brake pedal position sensor electrical connector. Refer to Brake Pedal Position Sensor Replacement .
    4. Fig 1: Brake Pedal
    GM2347572Courtesy of GENERAL MOTORS COMPANY
  4. Release the brake pedal (1) from the power vacuum brake booster pushrod by lifting the pedal upward.
    5. NOTE:

    Do not reuse the brake pedal retainer.

  5. Remove and discard the brake pedal retainer.
  6. Disconnect the power vacuum brake booster vacuum sensor electrical connector.
    7. Fig 2: Power Brake Booster Vacuum Rear Pipe
    GM2607855Courtesy of GENERAL MOTORS COMPANY
  7. Release the power brake booster vacuum inlet pipe from the retainers (1) on the dash panel.
    8. Fig 3: Power Brake Booster Vacuum Sensor
    GM2607858Courtesy of GENERAL MOTORS COMPANY
  8. Remove the power brake booster vacuum sensor (1) from the power vacuum brake booster and position aside.
  9. Disconnect the brake fluid level indicator switch electrical connector.
  10. Remove the electronic brake and traction control module (EBTCM) . Refer to Electronic Brake and Traction Control Module with Brake Pressure Modulator Valve Replacement .
    11. Fig 4: Master Cylinder Nuts
    GM2280909Courtesy of GENERAL MOTORS COMPANY
  11. Remove the master cylinder nuts (1) .
    12. Fig 5: Master Cylinder
    GM2280910Courtesy of GENERAL MOTORS COMPANY
  12. Remove the master cylinder (1) .
  13. Inspect the master cylinder O-ring seal for damage and replace, if necessary.
    14. Fig 6: Power Vacuum Brake Booster Bolts
    GM2280911Courtesy of GENERAL MOTORS COMPANY
  14. Completely loosen the power vacuum brake booster bolts (1) .
    15. Fig 7: Power Vacuum Brake Booster
    GM2280912Courtesy of GENERAL MOTORS COMPANY
  15. Remove the power vacuum brake booster (1) .
  16. Inspect the power vacuum brake booster gasket (2) for damage and replace, if necessary.
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