GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 1998 🢒 Firebird 🢒 Brakes 🢒 Hydraulic Brakes 🢒 Power Vacuum Brake Booster Replacement

Removal Procedure

    Object Number: 184981 Size: SH
  1. Remove the hood rear seal.
  2. Remove the air inlet screen. Refer to Air Inlet Grille Panel Replacement in Body Front End.
  3. Remove the brake booster vacuum hose clamp (9) and the vacuum hose (8) from the check valve (4).
  4. Remove the master cylinder nuts (7) attaching the master cylinder (6) to the brake booster (1).
  5. Remove the master cylinder from the brake booster.
    6. • Move the master cylinder forward and toward the driver's side in order to provide clearance for the booster. Moving the master cylinder will flex the brake pipes slightly.
    • Do not bend or distort the brake pipes.
  6. Remove the left side instrument panel insulator. Refer to Instrument Panel Insulator Replacement in Instrument Panel, Gauges and Console.

    7. Object Number: 184982 Size: SH
  7. Remove the brake pedal nuts (3) attaching the brake booster to the brake pedal with bracket (6).
  8. On vehicles equipped with manual transmissions, loosen the clutch master cylinder nuts (5).
  9. Remove the brake booster pushrod (8) from the brake pedal lever pin.
    10. • From inside the vehicle, remove the brake pedal pushrod retainer (7) and the pushrod washer (4).
    • Tilt the entire brake booster slightly in order to work the brake booster pushrod (8) off the brake pedal pin. Do no put undue side pressure on the pushrod.

    Object Number: 184981 Size: SH
  10. Remove the power brake booster (1) from the vehicle.

Installation Procedure

    Object Number: 184981 Size: SH
  1. Install the power brake booster (1) onto the vehicle.

    2. Object Number: 184982 Size: SH
  2. Install the brake booster pushrod (8) onto the brake pedal lever pin (1).
    3. • Tilt the entire brake booster slightly in order to work the brake booster pushrod (8) onto the brake pedal pin. Do not put undue side pressure on the pushrod.
    • From inside the vehicle, install the brake pedal pushrod washer (4) and the pushrod retainer (7).

    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 nuts.

    4. Tighten
    Tighten the brake pedal nuts to 20 N·m (15 lb ft) in the following sequence:

    3.1. Inboard upper
    3.2. Outboard lower
    3.3. Outboard upper
    3.4. Inboard lower
  4. On vehicles equipped with manual transmissions, tighten the clutch master cylinder nuts (5).

    5. Tighten
    Tighten the clutch master cylinder nuts to 27 N·m (20 lb ft).


    Object Number: 184981 Size: SH
  5. Install the master cylinder (6) onto the brake booster (1).
  6. Install the master cylinder nuts attaching the master cylinder to the brake booster.

    7. Tighten
    Tighten the brake master cylinder nuts to 29 N·m (21 lb ft).

  7. Connect the vacuum hose (8) and the clamp (9) to the check valve (10).
  8. Install the left hand instrument panel insulator. Refer to Instrument Panel Insulator Replacement in Instrument Panel, Gauges and Console.
  9. Install the transmission fluid filler tube. Refer to Filler Tube Replacement in Automatic Transaxle.
  10. Install the air inlet screens. Refer to Air Inlet Grille Panel Replacement in Body Front End.