GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Caution: Refer to Brake Fluid Irritant Caution in the Preface section.

Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice in the Preface section.

  1. Remove the underhood electrical center. Refer to Underhood Electrical Center or Junction Block Replacement .
  2. Remove and position aside the surge tank. Refer to Radiator Surge Tank Replacement .

  3. Object Number: 1874803  Size: SH
  4. Disconnect the vacuum brake booster vacuum check valve and hose from the vacuum brake booster and position aside.
  5. Remove the master cylinder. Refer to Master Cylinder Replacement .
  6. Remove the brake pressure modulator valve (BPMV). Refer to Brake Pressure Modulator Valve Replacement .

  7. Object Number: 1874783  Size: SH
  8. Remove the driver knee bolster. Refer to Driver Knee Bolster Replacement .
  9. Remove the vacuum brake booster pushrod retainer (1).
  10. Disconnect the vacuum brake booster pushrod from the brake pedal.

  11. Object Number: 1875738  Size: SH
  12. Remove the 4 vacuum brake booster nuts (1).

  13. Object Number: 1921721  Size: SH
  14. Carefully pull the vacuum brake booster forward until the mounting studs clear the dash panel.
  15. Important: Ensure the foam insulator on the mounting surface of the vacuum brake booster withdraws with the booster.

  16. Remove the vacuum brake booster (1).

  17. Object Number: 1921723  Size: SH
  18. Inspect the vacuum brake booster gasket (1) for damage and replace if necessary.

Installation Procedure


    Object Number: 1921723  Size: SH
  1. Install the vacuum brake booster gasket (1).
  2. Important: Ensure the foam insulator on the mounting surface of the vacuum brake booster is properly installed on the booster.


    Object Number: 1921721  Size: SH
  3. While guiding the brake booster pushrod and mounting studs through the dash panel, install the vacuum brake booster (1).
  4. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1875738  Size: SH
  5. Install the 4 vacuum brake booster nuts (1).
  6. Tighten
    Tighten the nuts to 25 N·m (18 lb ft).


    Object Number: 1874783  Size: SH
  7. Connect the vacuum brake booster pushrod to the brake pedal.
  8. Install the vacuum brake booster pushrod retainer (1).
  9. Rotate the vacuum brake booster pushrod retainer 360 degrees to ensure it is properly installed.

  10. Install the driver knee bolster. Refer to Driver Knee Bolster Replacement .
  11. Install the BPMV. Refer to Brake Pressure Modulator Valve Replacement .
  12. Install the master cylinder. Refer to Master Cylinder Replacement .

  13. Object Number: 1874803  Size: SH
  14. Connect the vacuum brake booster vacuum check valve and hose to the vacuum brake booster.
  15. Install the surge tank. Refer to Radiator Surge Tank Replacement .
  16. Install the underhood electrical center. Refer to Underhood Electrical Center or Junction Block Replacement .

Removal Procedure

Warning: Refer to Brake Fluid Irritant Warning in the Preface section.

Caution: Refer to Brake Fluid Effects on Paint and Electrical Components Caution in the Preface section.

  1. Remove the underhood electrical center. Refer to Underhood Electrical Center or Junction Block Replacement.
  2. Remove and position aside the surge tank. Refer to Radiator Surge Tank Replacement.

  3. Object Number: 1874803  Size: SH
  4. Disconnect the vacuum brake booster vacuum check valve and hose from the vacuum brake booster and position aside.
  5. Remove the master cylinder. Refer to Master Cylinder Replacement.
  6. Remove the brake pressure modulator valve (BPMV). Refer to Brake Pressure Modulator Valve Replacement.

  7. Object Number: 1874783  Size: SH
  8. Remove the driver knee bolster. Refer to Driver Knee Bolster Replacement.
  9. Remove the vacuum brake booster pushrod retainer (1).
  10. Disconnect the vacuum brake booster pushrod from the brake pedal.

  11. Object Number: 1875738  Size: SH
  12. Remove the 4 vacuum brake booster nuts (1).

  13. Object Number: 1921721  Size: SH
  14. Carefully pull the vacuum brake booster forward until the mounting studs clear the dash panel.
  15. Note: Ensure the foam insulator on the mounting surface of the vacuum brake booster withdraws with the booster.

  16. Remove the vacuum brake booster (1).

  17. Object Number: 1921723  Size: SH
  18. Inspect the vacuum brake booster gasket (1) for damage and replace if necessary.

Installation Procedure


    Object Number: 1921723  Size: SH
  1. Install the vacuum brake booster gasket (1).

  2. Object Number: 1921721  Size: SH

    Note: Ensure the foam insulator on the mounting surface of the vacuum brake booster is properly installed on the booster.

  3. While guiding the brake booster pushrod and mounting studs through the dash panel, install the vacuum brake booster (1).
  4. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1875738  Size: SH
  5. Install the 4 vacuum brake booster nuts (1).
  6. Tighten
    Tighten the nuts to 25 N·m (18 lb ft).


    Object Number: 1874783  Size: SH
  7. Connect the vacuum brake booster pushrod to the brake pedal.
  8. Install the vacuum brake booster pushrod retainer (1).
  9. Rotate the vacuum brake booster pushrod retainer 360 degrees to ensure it is properly installed.

  10. Install the driver knee bolster. Refer to Driver Knee Bolster Replacement.
  11. Install the BPMV. Refer to Brake Pressure Modulator Valve Replacement.
  12. Install the master cylinder. Refer to Master Cylinder Replacement.

  13. Object Number: 1874803  Size: SH
  14. Connect the vacuum brake booster vacuum check valve and hose to the vacuum brake booster.
  15. Install the surge tank. Refer to Radiator Surge Tank Replacement.
  16. Install the underhood electrical center. Refer to Underhood Electrical Center or Junction Block Replacement.