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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 44 (Hydraulic Brake System) >> Repair Instructions >> Power Vacuum Brake Booster Replacement (LS4) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the upper intake manifold sight shield. Refer to Upper Intake Manifold Sight Shield Replacement .
  2. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .
  3. Remove the brake pressure modulator valve (BPMV) bracket. Refer to Brake Pressure Modulator Valve Bracket Replacement .
  4. Remove the exhaust crossover pipe. Refer to Exhaust Crossover Pipe Replacement (3.6L) or Exhaust Crossover Pipe Replacement (3.8L) .
    5. Fig 1: Identifying Vacuum Power Brake Booster Check Valve & Hose Assembly
    GM1994002Courtesy of GENERAL MOTORS CORP.
  5. Disconnect the vacuum power brake booster check valve and hose assembly (1).
  6. Disconnect the vacuum power brake booster vacuum sensor electrical connector.
  7. Remove the left side instrument panel insulator panel. Refer to Instrument Panel Insulator Panel Replacement - Left Side .
    8. Fig 2: Identifying Brake Pedal Pushrod Nut
    GM1993996Courtesy of GENERAL MOTORS CORP.
  8. Remove the vacuum power brake booster pushrod nut (1).
    9. Fig 3: Identifying Brake Pedal Pushrod Bushing
    GM1993997Courtesy of GENERAL MOTORS CORP.
  9. Remove the vacuum power brake booster pushrod bushing (1).
    10. Fig 4: View Of Brake Pedal Pushrod Nut
    GM1993998Courtesy of GENERAL MOTORS CORP.
  10. Remove the vacuum power brake pushrod (1) from the brake pedal pin.
    11. Fig 5: Identifying Master Cylinder Nuts
    GM1994005Courtesy of GENERAL MOTORS CORP.
  11. Remove the master cylinder nuts (1).
  12. Without disconnecting the brake pipes, remove and position aside the brake master cylinder.

    Secure the master cylinder with heavy mechanics wire or equivalent.

  13. Install the J 22805-B  to the vacuum power brake booster and secure with the master cylinder nuts. See Special Tools .
    14. Fig 6: View Of Power Brake Booster Assembly
    GM1994008Courtesy of GENERAL MOTORS CORP.
  14. Press the vacuum power brake booster locking tab (1) while rotating the J 22805-B  (2) counter clockwise. See Special Tools .
  15. Remove the vacuum power brake booster.
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