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Home >> Buick >> 2018 >> Encore Preferred, AWD >> Repair and Diagnosis (Single Page) >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brake System >> Repair Instructions >> Power Vacuum Brake Booster Replacement >> Removal Procedure

Removal Procedure

  1. With the engine OFF, apply and release the brake pedal several times until the pedal becomes firm to deplete the power vacuum brake booster vacuum reserve.
  2. Remove the battery tray. Refer to Battery Tray Replacement .
  3. Disconnect the power vacuum brake booster vacuum sensor electrical connector, if equipped.
  4. GM2771949

    If equipped, remove the power vacuum brake booster vacuum sensor (1) from the power vacuum brake booster.

  5. GM2512974

    If equipped, remove the power brake booster vacuum check valve (1) from the power vacuum brake booster.

  6. Remove the driver side instrument panel knee bolster. Refer to Instrument Panel Knee Bolster Replacement (Buick)Instrument Panel Knee Bolster Replacement (Chevrolet) .
  7. GM2539396

    Compress the tabs on the top and bottom of the brake booster pushrod retainer (1) and lift the brake pedal (2) rearward to disconnect the brake pedal from the power brake booster pushrod.

  8. Inspect the brake booster pushrod retainer for damage and replace, if necessary.
  9. Remove the master cylinder. Refer to Brake Master Cylinder Replacement .
  10. GM2495352

    If equipped with antilock brakes, disconnect the front and rear brake pipe fittings (1) from the brake pressure modulator valve (BPMV). Refer to Brake Pressure Modulator Valve Replacement .

  11. GM2910027

    Completely loosen the power vacuum brake booster bolts (1).

  12. Remove the power vacuum brake booster.
  13. Inspect the power vacuum brake booster gasket for damage and replace, if necessary.
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