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.

Caution: Hydraulic brake systems use two distinct and incompatible fluids. Power steering fluid is used in the hydraulic brake booster system. Brake fluid is used in the master cylinder and brake pipes. Use extreme care when selecting brake system fluids, or seal damage can result. Refer to General Information to select the correct fluid.

For information on checking and adding fluid to the power brake booster system, refer to Checking and Adding Power Steering Fluid.

For information on bleeding the power brake booster system, refer to Power Steering System Bleeding.

For information on flushing the power brake booster system, refer to Power Steering System Flushing.

1. Apply the park brake and block the wheels.
2. Without disconnecting the brake pipes, remove the master cylinder and support with heavy mechanics wire or equivalent. Refer to Master Cylinder Replacement.



3. Disconnect the power brake booster inlet hose fitting (1).

Inspect the O-ring seal for damage and replace, if necessary.




4. Disconnect the power brake booster outlet hose fitting (1).

Inspect the O-ring seal for damage and replace, if necessary.




5. Remove the power brake booster pushrod retaining clip bolt (1).



6. Remove the power brake booster pushrod retaining clip (1).



7. Disconnect the stoplamp switch electrical connector.
8. Disconnect the power brake booster pushrod and remove the stoplamp switch (1).



9. Remove the power brake booster nuts (1).
10. Remove the power brake booster.
11. Remove the power brake booster gasket.

Inspect the power brake booster gasket for damage and replace, if necessary.

1. Install the power brake booster gasket.
2. Install the power brake booster.

Caution: Refer to Fastener Caution in the Preface section.

3. Install the power brake booster nuts (1) and tighten to  36 N·m (27 lb ft).



4. Apply a thin coat of high temperature lubricant, GM P/N 12345994 (Canadian P/N 10953501) to the brake pedal pivot pin.
5. Install the stoplamp switch (1) and simultaneously connect the power brake booster pushrod.
6. Connect the stoplamp switch electrical connector.



7. Install the power brake booster pushrod retaining clip (1).
8. Rotate the power brake booster retaining clip 360 degrees to ensure the clip is fully engaged in the brake pedal pivot pin groove.



9. Install the power brake booster pushrod retaining clip bolt (1) and tighten to  10 N·m (89 lb in).

Note: Ensure the O-ring seals are properly positioned on the power brake booster inlet and outlet hose fittings.




10. Connect the power brake booster outlet hose fitting (1) and tighten the fitting to  33 N·m (24 lb ft).



11. Connect the power brake booster inlet hose fitting (1) and tighten the fitting to  33 N·m (24 lb ft).
12. Install the master cylinder. Refer to Master Cylinder Replacement.
13. Bleed the power steering system. Refer to Power Steering System Bleeding.