Caution: Do not move the vehicle until a firm brake pedal is obtained. Air in the brake system can cause the loss of brakes with possible personal injury.

Caution: Remove all the air from the hydraulic brake system anytime the hydraulic brake system is opened for repair. The entire bleeding procedure must be followed. Failure to remove all the air in the hydraulic brake system will result in reduced braking performance and possible personal injury.

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

Caution: Refer to DOT 4 Brake Fluid Caution in the Preface section.

Notice: When adding fluid to the brake fluid reservoir or to the clutch fluid reservoir, use only Super DOT-4 or equivalent DOT-4 brake fluid from a clean, sealed container. This polyglycol brake fluid is hygroscopic and absorbs moisture. Do not use fluid from an open container that may be contaminated with water. Improper or contaminated fluid could result in damage to the system components.

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

Important: Bleed the hydraulic brake system in the following sequence:

1. The master cylinder
2. The right rear bleeder valve
3. The left rear bleeder valve
4. The right front bleeder valve
5. The left front bleeder valve

If air enters the hydraulic brake system due to low brake fluid level, bleed the system at the master cylinder and at the 4 bleeder valves.

If you disconnect a brake pipe from the master cylinder, bleed the system at the master cylinder and at the 4 bleeder valves.

If you disconnect a brake pipe or a fitting between the master cylinder and the wheels, bleed the system at the bleeder valve served by the brake pipe or fitting.

If you disconnect a brake pipe or brake hose at only 1 wheel, bleed the system at the bleeder valve for that wheel.

1. Clean the master cylinder reservoir cap (1) and the reservoir.
2. Clean the master cylinder.
3. Clean the brake pipes around the master cylinder.
4. Place a container under the master cylinder in order to catch the brake fluid.
5. Loosen the flare nut for the front brake pipe (3) in order to purge air from the front of the master cylinder. Allow the fluid to drip from the connection for approximately 1 minute.

Notice: Refer to Fastener Notice in the Preface section.

6. Tighten the flare nut.

Tighten
Tighten the flare nut to 14 N·m (10 lb ft).

1. With the ignition switch in the OFF position and the brakes cool, press the brake pedal several times in order to deplete the vacuum assist system reserve.
2. Clean the master cylinder reservoir cap and the reservoir.
3. Remove the reservoir cap.
4. Remove the reservoir cap seal.

Important: Ensure the brake fluid level stays above half-full during the bleeding procedure.

5. Fill the reservoir with GM Vehicle Care® Brake and Clutch Fluid Super DOT-4, GM P/N 88958860, or the equivalent DOT-4 brake fluid. Refer to Master Cylinder Reservoir Filling .
6. Install the reservoir cap seal.
7. Install the reservoir cap.
8. Remove the bleeder valve cap.
9. Place the bleeder valve wrench on the bleeder valve.



10. Install a transparent hose (1) over the end of the bleeder valve (2). Submerge the other end of the hose in a transparent container (5) partially filled with brake fluid.
11. Have the assistant slowly press the brake pedal and maintain pressure on the brake pedal.
12. Loosen the bleeder valve in order to purge air from the wheel hydraulic circuit.
13. Close the bleeder valve.

Tighten
Tighten the bleeder valve to 12 N·m (106 lb in).

14. Have the assistant slowly release the pedal.
15. Wait 15 seconds.
16. Repeat this procedure until air (6) is purged from the wheel hydraulic circuit.
17. Remove the hose from the bleeder valve.
18. Remove the wrench from the bleeder valve.
19. Install the bleeder valve cap.
20. Repeat this procedure at all bleeder valves that require bleeding.
21. Ensure the brake fluid level is correct. Refer to Master Cylinder Reservoir Filling .
22. Slowly press and release the brake pedal. Observe the feel of the brake pedal.
23. If the brake pedal feels spongy, repeat the bleeding procedure.
24. Inspect the hydraulic brake system for external leaks. Refer to Brake System External Leak Inspection .
25. Turn the ignition switch to the ON position with the engine OFF. Inspect the instrument cluster.
26. If the brake system warning lamp remains illuminated, refer to Symptoms - Hydraulic Brakes .