GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2005 🢒 DeVille 🢒 Brakes 🢒 Hydraulic Brakes 🢒 Power Vacuum Brake Booster Replacement

Removal Procedure
  1. Place the vehicle on a flat surface.
  2. Block the front wheels.
  3. Apply the parking brake.

    4. Object Number: 491257 Size: SH
  4. To allow access for the removal of the vacuum brake booster, position the gearshift lever into the lowest gear.
  5. Remove air cleaner assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls - 4.6L.
  6. Remove the cruise control module and position it out of the way. Refer to Cruise Control Module Replacement in Cruise Control.
  7. Remove the accelerator control cable and position it out of the way. Refer to Accelerator Control Cable Replacement in Engine Controls - 4.6L.
  8. Remove the accelerator control cable bracket and position it out of the way. Refer to Accelerator Control Cable Bracket Replacement in Engine Controls - 4.6L.

    9. Object Number: 678819 Size: SH
  9. Disconnect the electrical connector (2) at the left strut tower. Refer to Master Electrical Component List in Wiring Systems.

    10. Object Number: 177410 Size: SH
  10. Remove the master cylinder mounting nuts (3).
  11. Disconnect the master cylinder (1) from the brake booster (2).
  12. 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.
  13. 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 in Automatic Transaxle - 4T80-E.

    14. Object Number: 491255 Size: SH
  14. Disconnect the vacuum check valve (2) from the vacuum booster.
  15. Remove the inlet heater pipe. Refer to Heater Inlet Pipe Replacement in Heating, Ventilation and Air Conditioning.
  16. Remove the left closeout insulator panel. Refer to Instrument Panel Insulator Panel Replacement - Left Side in Instrument Panel, Gages, and Console.
  17. Remove the left knee bolster bracket. Refer to Driver Knee Bolster Bracket Replacement in Instrument Panel, Gages, and Console.
  18. To access the left lower brake pedal to vacuum brake booster mounting nut, remove the steering column mounting nuts. Refer to Steering Column Replacement in Steering Wheel and Column.
  19. Lower the steering column and secure it.

    20. Object Number: 569134 Size: SH
  20. Remove the vacuum brake booster pushrod retaining clip (2) from the brake pedal clevis pin.
  21. Remove the foam spacer from the brake pedal clevis pin.
  22. Disconnect the brake booster pushrod from the brake pedal clevis pin.

    23. Object Number: 287894 Size: SH
  23. Remove the vacuum brake booster mounting nuts (2, 3) from the brake pedal assembly.

    24. Object Number: 106322 Size: SH
  24. Remove the vacuum brake booster from the vehicle.
  25. Remove the vacuum brake booster mounting gasket, if gasket replacement is necessary.

Installation Procedure
  1. Install the vacuum brake booster mounting gasket to the booster, if removed previously.

    2. Object Number: 106322 Size: SH
  2. Install the vacuum brake booster to the vehicle.

    3. Object Number: 287894 Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  3. Install the brake pedal assembly to booster stud mounting nuts (1, 2, 3) to the booster studs.

    4. Tighten
    Tighten the brake pedal assembly to booster stud mounting nuts to 36 N·m (27 lb ft).


    Object Number: 569134 Size: SH
  4. Apply a small amount of lubricant, GM P/N 12346293 or equivalent to the clevis pin of the brake pedal.
  5. Connect the vacuum brake booster pushrod to the brake pedal clevis pin.
  6. Install the foam spacer (1) to the brake pedal clevis pin.
  7. Install the retainer clip (2) to the brake pedal assembly clevis pin.
  8. Install the steering column.
  9. Install the steering column mounting attaching nuts. Refer to Steering Column Replacement in Steering Wheel and Column.
  10. Install the left knee bolster bracket. Refer to Driver Knee Bolster Bracket Replacement in Instrument Panel, Gages, and Console.
  11. Install the left closeout insulator panel. Refer to Instrument Panel Insulator Panel Replacement - Left Side in Instrument Panel, Gages, and Console.
  12. Install the inlet heater pipe. Refer to Heater Inlet Pipe Replacement in Heating, Ventilation and Air Conditioning.
  13. Install the shift control cable to the shift cable bracket. Refer to Automatic Transmission Range Selector Cable Replacement - Console in Automatic Transaxle - 4T80-E.

    14. Object Number: 491324 Size: SH
  14. Position the gearshift lever into park.

    15. Object Number: 491255 Size: SH
  15. Install the brake booster vacuum check valve (2) to the vacuum brake booster.
  16. Install the Master cylinder to the vacuum brake booster. Refer to Master Cylinder Replacement .

    17. Object Number: 678819 Size: SH
  17. Connect the electrical connector (2) to the left strut tower. Refer to Master Electrical Component List in Wiring Systems.
  18. Install the accelerator control cable. Refer to Accelerator Control Cable Replacement in Engine Controls - 4.6L.
  19. Install the accelerator control cable bracket. Refer to Accelerator Control Cable Bracket Replacement in Engine Controls - 4.6L.
  20. Install the cruise control module. Refer to Cruise Control Module Replacement in Cruise Control.
  21. Remove the blocks from the front wheels.
  22. Release the parking brake.