Bleeding Complete Brake Hydraulic System
- Use Global Diagnostic System (GDS) to deactivate brake boost system with disconnect brake fluid level sensor.
- Place a clean shop cloth beneath the brake master cylinder to prevent brake fluid spills.
- Clean the outside of the reservoir on and around the reservoir cap prior to removing the cap and diaphragm.
- Fill the brake master cylinder reservoir with GM approved 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. Brake Master Cylinder Reservoir Filling
- Check the brake fluid level in the CH-29532-A Pressure Brake Bleeder. Add GM approved brake fluid from a clean, sealed brake fluid container as necessary to bring the level to approximately the half-full point. Adhesives, Fluids, Lubricants, and Sealers
- Install the CH-44894-A Brake Bleeder Adapter to the brake master cylinder reservoir.
- Connect the CH-29532-A Pressure Brake Bleeder, to the CH-44894-A Brake Bleeder Adapter.
- Charge the CH-29532-A Pressure Brake Bleeder, air tank to 207 - 310 kPa (30 - 45 psi) .
- Open the CH-29532-A Pressure Brake Bleeder, fluid tank valve to allow pressurized brake fluid to enter the brake system.
- 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. Brake System External Leak Inspection
- Install a proper box-end wrench onto the LEFT REAR wheel hydraulic circuit bleeder valve.
- Install a transparent hose over the end of the bleeder valve.
- Submerge the open end of the transparent hose into a transparent, graduated container partially filled with GM approved brake fluid from a clean, sealed brake fluid container. Note amount of fluid in the container. Adhesives, Fluids, Lubricants, and Sealers
- Loosen the bleeder valve to purge air from the wheel hydraulic circuit.
- Allow fluid to flow until air bubbles stop flowing from the bleeder.
- After all air has been purged from the hydraulic circuit, close the bleeder valve.
- Install a proper box-end wrench onto the LEFT FRONT wheel hydraulic circuit bleeder valve, then repeat steps 12-17.
- Install a proper box-end wrench onto the RIGHT FRONT wheel hydraulic circuit bleeder valve, then repeat steps 12-17.
- Install a proper box-end wrench onto the RIGHT REAR wheel hydraulic circuit bleeder valve, then repeat steps 12-17.
- After all air has been purged from the hydraulic circuit, tighten the bleeder valve to the necessary torque specification and install the dust cap.
- Close the CH-29532-A Pressure Brake Bleeder, fluid tank valve, then disconnect the CH-29532-A Pressure Brake Bleeder, from the CH-44894-A Brake Bleeder Adapter.
- Remove the CH-44894-A Brake Bleeder Adapter from the brake master cylinder reservoir.
- Fill the brake master cylinder reservoir to the maximum-fill level with GM approved brake fluid from a clean, sealed brake fluid container. Adhesives, Fluids, Lubricants, and Sealers
- Inspect the brake system for external leaks. Brake System External Leak Inspection
- Run the GDS - Brake Hydraulic Test, if it fails. Antilock Brake System Automated Bleed
- Connect the brake fluid level sensor.
- Turn the ignition ON, with the engine OFF. Check to see if the brake system warning lamp remains illuminated.
- If the brake system warning lamp remains illuminated, go to Diagnostic Starting Point - Vehicle .
NOTE:
The pressure bleeding equipment must be the diaphragm type. The rubber diaphragm between the air supply and the brake fluid prevents air, moisture, oil, and other contaminants from entering the hydraulic system.
NOTE:
DO NOT allow the vehicle to be driven until it is diagnosed and repaired.