Acadia AWD V6-3.6L (2008)
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.
22. Turn the ignition key ON, with the engine OFF. Check to see if the brake system warning lamp remains illuminated.
Important: If the brake system warning lamp remains illuminated, DO NOT allow the vehicle to be driven until it is diagnosed and
repaired.
23. If the brake system warning lamp remains illuminated, refer to Symptoms - Hydraulic Brakes (See: Brakes and Traction Control/Hydraulic
System/Testing and Inspection/Symptom Related Diagnostic Procedures/Symptoms - Hydraulic Brakes) .
Pressure
Hydraulic Brake System Bleeding (Pressure)
Tools Required
*
J 29532 Diaphragm Type Brake Pressure Bleeder, or equivalent
*
J 44894-A Brake Pressure Bleeder Adapter
Caution: Refer to Brake Fluid Irritant Caution .
Notice: When adding fluid to the brake master cylinder reservoir, use only GM approved 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 catch brake fluid spills.
2. With the ignition OFF and the brakes cool, apply the brakes 3-5 times, or until the brake pedal becomes firm, in order to deplete the brake booster
power reserve.
3. If you have performed a brake master cylinder bench bleeding on this vehicle, or if you disconnected the brake pipes from the master cylinder, or
if you have disconnected the brake pipes from the proportioning valve assembly or the brake modulator assembly, you must perform the following
steps to bleed air at the ports of the hydraulic component:
1. If removal of the reservoir cap and diaphragm is necessary, clean the outside of the reservoir on and around the cap prior to removal.
2. With the brake pipes installed securely to the master cylinder, proportioning valve assembly, or brake modulator assembly, loosen and separate
one of the brake pipes from the port of the component.
For the proportioning valve assembly or the brake modulator assembly, perform these steps in the sequence of system flow; begin with the
fluid feed pipes from the master cylinder.
3. Allow a small amount of brake fluid to gravity bleed from the open port of the component.
4. Reconnect the brake pipe to the component and tighten securely.
5. Have an assistant slowly depress the brake pedal fully and maintain steady pressure on the pedal.
6. Loosen the same brake pipe to purge air from the open port of the component.
7. Tighten the brake pipe, then have the assistant slowly release the brake pedal.
8. Wait 15 seconds, then repeat steps 3.3-3.7 until all air is purged from the same port of the component.
9. With the brake pipe installed securely to the master cylinder, proportioning valve assembly, or brake modulator assembly, and after all air has
been purged from the first port of the component that was bled, loosen and separate the next brake pipe from the component, then repeat steps
3.3-3.8 until each of the ports on the component has been bled.
10. After completing the final component port bleeding procedure, ensure that each of the brake pipe-to-component fittings is properly tightened.
4. Clean the outside of the reservoir on and around the reservoir cap prior to removing the cap and diaphragm.
5. Install the J 44894-A to the brake master cylinder reservoir.
6. Connect the J 29532 , or equivalent, to the J 44894-A .
7. Charge the J 29532 , or equivalent, air tank to 175-205 kPa (25-30 psi).
8. Open the J 29532 , or equivalent, fluid tank valve to allow pressurized brake fluid to enter the brake system.
9. Wait approximately 30 seconds, then inspect the entire hydraulic brake system in order to ensure that there are no existing external brake fluid
leaks.
Any brake fluid leaks identified require repair prior to completing this procedure.
10. Install a proper box-end wrench onto the RIGHT REAR wheel hydraulic circuit bleeder valve.
11. Install a transparent hose over the end of the bleeder valve.
12. Loosen the bleeder valve to purge air from the wheel hydraulic circuit. Allow fluid to flow until air bubbles stop flowing from the bleeder, then
tighten the bleeder valve.
13. With the right rear wheel hydraulic circuit bleeder valve tightened securely, and after all air has been purged from the right rear hydraulic circuit,
