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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 44 (Hydraulic Brake System) >> Repair Instructions >> Vacuum Brake Booster Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Positioning Gearshift Lever
    GM491257Courtesy of GENERAL MOTORS CORP.
  1. Place the vehicle on a flat surface.
  2. Block the front wheels.
  3. Apply the parking brake.
  4. To allow access for the removal of the vacuum brake booster, position the gearshift lever into the lowest gear.
  5. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .
  6. Disconnect the fuel vapor lines in front of the brake booster.
    7. Fig 2: Removing/Installing Master Cylinder
    GM177410Courtesy of GENERAL MOTORS CORP.
  7. Remove the master cylinder mounting nuts (3).
    8. IMPORTANT: In the following service step, the master cylinder does not have to be removed. Move the master cylinder forward just enough to clear the studs on the vacuum brake booster. This will flex the brake pipes slightly. Do not bend or distort the pipes.
  8. Disconnect the master cylinder (1) from the brake booster (2).
  9. Disconnect the shift control cable from the shaft lever pin and position it out of the way. Refer to Automatic Transmission Range Selector Cable Replacement - Console .
    10. Fig 3: View Of Vacuum Booster & Check Valve
    GM491255Courtesy of GENERAL MOTORS CORP.
  10. Disconnect the vacuum check valve (2) from the vacuum booster.
  11. Remove the inlet heater pipe from the bracket at the transmission. Refer to Heater Pipes Replacement .
  12. Remove the left closeout insulator panel. Refer to Instrument Panel Insulator Panel Replacement - Left Side .
  13. Remove the left knee bolster. Refer to Driver Knee Bolster Replacement .
  14. To access the left lower brake pedal to vacuum brake booster mounting nut, remove the steering column mounting nuts. Refer to Steering Column Replacement .
  15. Lower the steering column and secure it.
    16. Fig 4: Identifying Brake Pedal Assembly Clevis Pin
    GM1678341Courtesy of GENERAL MOTORS CORP.
  16. Remove the vacuum brake booster pushrod retaining clip (2) from the brake pedal clevis pin.
  17. Remove the foam spacer (3) from the brake pedal clevis pin.
  18. Disconnect the brake booster pushrod from the brake pedal clevis pin.
    19. Fig 5: Identifying Vacuum Brake Booster Mounting Nuts
    GM1678358Courtesy of GENERAL MOTORS CORP.
  19. Remove the vacuum brake booster mounting nuts (1) from the brake pedal assembly.
  20. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
    21. Fig 6: Locating Jackstands Under Engine Frame
    GM333761Courtesy of GENERAL MOTORS CORP.
  21. Support the front frame with jack stands.
  22. Loosen the left side bolts from the frame to the body. Refer to Frame Replacement - Front .
  23. Lower the left side frame 2-3 inches to gain enough clearance to remove the brake booster. Refer to Frame Replacement - Front .
    24. Fig 7: View of Vacuum Brake Booster
    GM106322Courtesy of GENERAL MOTORS CORP.
  24. Remove the vacuum brake booster from the vehicle.
    25. IMPORTANT: The gasket does not have to be replaced every time the booster is removed. Replace the gasket only if necessary.
  25. Remove the vacuum brake booster mounting gasket.
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