Chevrolet Trax: Power vacuum brake booster replacement

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.

Fig. 165: Power Brake Booster Vacuum Check Valve

4. Remove the power brake booster vacuum check valve (1) from the power vacuum brake booster.
5. Remove the driver side instrument panel knee bolster. Refer to Instrument Panel Knee Bolster Replacement (Encore) , Instrument Panel Knee Bolster Replacement (Trax) .

Fig. 166: Brake Booster Pushrod And Brake Pedal

6. 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.
7. Inspect the brake booster pushrod retainer for damage and replace, if necessary.
8. Remove the master cylinder. Refer to Master Cylinder Replacement.

Fig. 167: Front And Rear Brake Pipe Fittings

9. 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 .

Fig. 168: Power Vacuum Brake Booster And Bolts

10. Completely loosen the power vacuum brake booster bolts (1).
11. Remove the power vacuum brake booster.
12. Inspect the power vacuum brake booster gasket for damage and replace, if necessary.

Installation Procedure

1. Install the power vacuum brake booster gasket, if removed.

Fig. 169: Power Vacuum Brake Booster And Bolts

2. Install the power vacuum brake booster and bolts.

CAUTION: Refer to Fastener Caution .

NOTE: Do not over tighten the power vacuum brake booster bolts. If the power vacuum brake booster bolts are over tightened, the brake pedal may remain applied after a high pressure brake pedal application.

3. Install the power vacuum brake booster bolts (1) and tighten to 19 N.m (14 lb ft).

Fig. 170: Front And Rear Brake Pipe Fittings

4. If equipped with antilock brakes, connect the front and rear brake pipe fittings (1) to the BPMV. Refer to Brake Pressure Modulator Valve Replacement .
5. Install the master cylinder. Refer to Master Cylinder Replacement.

Fig. 171: Power Brake Booster Vacuum Check Valve

6. Install the power brake booster vacuum check valve (1) to the power vacuum brake booster.
7. Connect the power vacuum brake booster vacuum sensor electrical connector, if equipped.

Fig. 172: Brake Booster Pushrod And Brake Pedal

8. Install the power brake booster pushrod retainer (1) to the power brake booster pushrod, if removed.

NOTE: Ensure the power vacuum brake booster pushrod retainer is fully seated in the brake pedal arm.

9. Position the brake pedal (2) to the power brake booster pushrod retainer and firmly seat the brake pedal to the retainer.
10. Install the driver side instrument panel knee bolster. Refer to Instrument Panel Knee Bolster Replacement (Encore) , Instrument Panel Knee Bolster Replacement (Trax) .
11. Install the battery tray. Refer to Battery Tray Replacement .

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