GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2007 🢒 Acadia - 2WD 🢒 Brakes 🢒 Hydraulic Brakes 🢒 Power Vacuum Brake Booster Replacement

Removal Procedure
  1. Place the vehicle on a level surface and apply the park brake.
  2. With the engine OFF, apply and release the brake pedal several times until the brake pedal becomes firm to deplete the vacuum reserve in the vacuum brake booster.
  3. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .

    4. Object Number: 1862134 Size: SH
  4. Disconnect the master cylinder fluid level sensor electrical connector (1).
  5. Remove the vacuum brake booster check valve hose from the vacuum brake booster check valve (2) and position aside.
  6. Disconnect the vacuum brake booster vacuum sensor electrical connector (3) and position aside.

    7. Object Number: 1862135 Size: SH
  7. Release the front and rear brake pipes (1) from the routing clip on the frame rail.
  8. Remove the 2 nuts (2) from the brake pressure modulator valve (BPMV) assembly.

    9. Important: It is not necessary to disconnect the brake pipes from the BPMV assembly.

  9. Carefully lift the BPMV assembly over the studs and position forward slightly.

    10. Object Number: 1862137 Size: SH
  10. Remove the 2 brake master cylinder nuts.

    11. Important: It is not necessary to disconnect the brake pipes from the master cylinder.

  11. Without disconnecting the brake pipes from the master cylinder, remove the master cylinder assembly and position aside.

    12. Place the brake master cylinder in an upright position and support with heavy mechanics wire or equivalent.


    Object Number: 1862139 Size: SH
  12. Remove the left side instrument panel insulator panel. Refer to Instrument Panel Insulator Panel Replacement - Left Side .
  13. Remove the knee bolster. Refer to Knee Bolster Replacement .
  14. Remove the brake pedal pushrod retaining clip (1).
  15. Remove the brake pedal pushrod clevis pin (2) and disconnect the pushrod from the brake pedal.
  16. Remove the intermediate steering shaft. Refer to Intermediate Steering Shaft Replacement .

    17. Object Number: 1862142 Size: SH
  17. Remove the 4 vacuum brake booster nuts.

    18. Object Number: 1862147 Size: SH
  18. Pull the vacuum brake booster forward and tilt upward slightly until the mounting studs clear the dash panel.
  19. Remove the vacuum brake booster.

Installation Procedure

    Important: Inspect the vacuum brake booster to dash panel gasket for damage and replace, if necessary.


    Object Number: 1862147 Size: SH
  1. Align the vacuum brake booster mounting studs to the dash panel.
  2. Install the vacuum brake booster.

    3. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1862142 Size: SH
  3. Install the 4 vacuum brake booster nuts.

    4. Tighten
    Tighten the nuts to 25 N·m (18 lb ft).

  4. Install the intermediate steering shaft. Refer to Intermediate Steering Shaft Replacement .

    5. Object Number: 1862139 Size: SH
  5. Connect the brake pedal pushrod to the brake pedal and install the clevis pin (2).
  6. Install the brake pedal pushrod retaining clip (1).
  7. Install the knee bolster. Refer to Knee Bolster Replacement .
  8. Install the left side instrument panel insulator panel. Refer to Instrument Panel Insulator Panel Replacement - Left Side .

    9. Important: Ensure the master cylinder to vacuum brake booster seal is properly installed on the back of the master cylinder housing against the face of the master cylinder flange. Inspect the seal for damage and replace, if necessary.


    Object Number: 1862137 Size: SH
  9. Position the master cylinder to the vacuum booster.
  10. Install the 2 brake master cylinder nuts.

    11. Tighten
    Tighten the nuts to 20 N·m (15 lb ft).


    Object Number: 1862135 Size: SH
  11. Position the BPMV assembly over the studs.
  12. Install the 2 nuts (2) to the brake pressure modulator valve (BPMV) and bracket assembly.

    13. Tighten
    Tighten the nuts to 20 N·m (15 lb ft).

  13. Install the front and rear brake pipes (1) to the routing clip on the frame rail.

    14. Object Number: 1862134 Size: SH
  14. Connect the master cylinder fluid level sensor electrical connector (1).
  15. Connect the vacuum brake booster vacuum sensor electrical connector (3).

    16. Important: If necessary, a small amount of denatured alcohol may be used to aid installation of the brake booster check valve hose. Do not use soap.

  16. Install the vacuum brake booster check valve hose to the vacuum brake booster check valve (2).
  17. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .