CAUTION:: This system operates using fluid pressure up to 12 400 kPa (1800 psi). Some malfunctions can cause this pressure to be trapped in the system. Use caution when loosening pipe fittings on a system that does not work or personal injury can result.

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

Notice: When adding fluid to the brake master cylinder reservoir, use only Delco Supreme 11®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container. The use of any type of fluid other than the recommended type of brake fluid, may cause contamination which could result in damage to the internal rubber seals and/or rubber linings of hydraulic brake system components.

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

Important: Pressure must be removed before servicing.

1. To relieve the brake system pressure, pump the brake pedal at least 8 times or until the pedal becomes hard.



2. Remove the brake fluid from the hydraulic brake booster reservoir.
3. Disconnect the electrical connector from the pump.
4. Disconnect the hydraulic pressure feed line from the booster.
5. Install a plug or cap to the pressure line to prevent brake fluid loss and contamination.
6. Disconnect the return line from the booster.
7. Install a plug or cap to the return line to prevent brake fluid loss and contamination.
8. Remove the booster pump mounting fasteners.
9. Remove the booster pump from the vehicle.

1. Install the booster pump to the vehicle.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

2. Install the booster pump mounting nuts and bolt.

Tighten
Tighten the booster pump mounting nuts and bolt to 9 N·m (80 lb in).

3. Connect the hydraulic pressure feed line to the booster.

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

4. Install the return hose to the booster.
5. Install the return hose clamp to the booster hose.
6. Fill the booster reservoir.
7. Connect the electrical connector to the pump.
8. If the hydraulic system was opened, bleed the brake system. Refer to Hydraulic Brake System Bleeding .