Impala V6-3.9L (2007)
Brake Bleeding: Service and Repair
Hydraulic Brake System Bleeding
Manual
Hydraulic Brake System Bleeding (Manual)
Caution: Refer to Brake Fluid Irritant Caution.
Notice: When adding fluid to the brake master cylinder reservoir, use only Delco Supreme 11(R), 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.
1. Place a clean shop cloth beneath the brake master cylinder to prevent brake fluid spills.
2. With the ignition OFF and the brakes cool, apply the brakes 3-5 times, or until the brake pedal effort increases significantly, in order to deplete the
brake booster power reserve.
Important: If you have performed a brake master cylinder bench bleeding, disconnected the brake pipes from the master cylinder,
replaced the ABS pressure modulator valve, or disconnected the jumper lines from the master cylinder to the ABS pressure valve, you
MUST use the pressure bleeding procedure to remove all the air from the system. Refer to Hydraulic Brake System Bleeding (Manual)
Hydraulic Brake System Bleeding (Pressure).
3. Fill the brake master cylinder reservoir with Delco Supreme 11(R), GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid
from a clean, sealed brake fluid container. Ensure that the brake master cylinder reservoir remains at least half-full during this bleeding procedure.
Add fluid as needed to maintain the proper level.
Clean the outside of the reservoir on and around the reservoir cap prior to removing the cap and diaphragm.
4. Install a proper box-end wrench onto the RIGHT REAR wheel hydraulic circuit bleeder valve.
5. Install a transparent hose over the end of the bleeder valve.
6. Submerge the open end of the transparent hose into a transparent container partially filled with Delco Supreme 11(R), GM P/N 12377967
(Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.
7. Have an assistant slowly depress the brake pedal fully and maintain steady pressure on the pedal.
8. Loosen the bleeder valve to purge air from the wheel hydraulic circuit.
9. Tighten the bleeder valve, then have the assistant slowly release the brake pedal.
10. Wait 15 seconds, then repeat steps 7-9 until all air is purged from the same wheel hydraulic circuit.
11. With the right rear wheel hydraulic circuit bleeder valve tightened securely, after all air has been purged from the right rear hydraulic circuit,
install a proper box-end wrench onto the LEFT FRONT wheel hydraulic circuit bleeder valve.
12. Install a transparent hose over the end of the bleeder valve, then repeat steps 6-10.
13. With the left front wheel hydraulic circuit bleeder valve tightened securely, after all air has been purged from the left front hydraulic circuit, install
a proper box-end wrench onto the LEFT REAR wheel hydraulic circuit bleeder valve.
14. Install a transparent hose over the end of the bleeder valve, then repeat steps 6-10.
15. With the left rear wheel hydraulic circuit bleeder valve tightened securely, after all air has been purged from the left rear hydraulic circuit, install a
proper box-end wrench onto the RIGHT FRONT wheel hydraulic circuit bleeder valve.
16. Install a transparent hose over the end of the bleeder valve, then repeat steps 6-10.
17. After completing the final wheel hydraulic circuit bleeding procedure, ensure that each of the 4 wheel hydraulic circuit bleeder valves are properly
tightened.
18. Fill the brake master cylinder reservoir to the maximum-fill level with Delco Supreme 11(R), GM P/N 12377967 (Canadian P/N 992667), or
equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.
19. Slowly depress and release the brake pedal. Observe the feel of the brake pedal.
Important: If it is determined that air was induced into the system upstream of the ABS modulator prior to servicing, the Antilock Brake
System Automated Bleed Procedure must be performed.
20. If the brake pedal feels spongy, repeat the bleeding procedure again. If the brake pedal still feels spongy after repeating the bleeding procedure,
perform the following steps:
1. Inspect the brake system for external leaks. Refer to Brake System External Leak Inspection. See: Brakes and Traction Control/Hydraulic
System/Testing and Inspection/Component Tests and General Diagnostics/Brake System External Leak Inspection
2. Pressure bleed the hydraulic brake system in order to purge any air that may still be trapped in the system.
21. Turn the ignition key ON, with the engine OFF. Check to see if the brake system warning lamp remains illuminated.
Important: DO NOT allow the vehicle to be driven until it is diagnosed and repaired.
