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Hydraulic Brake System Bleeding - Pressure

Special Tools

    • CH-29532 Diaphragm Type Brake Pressure Bleeder, or equivalent
    • CH-44894-A Brake Pressure Bleeder Adapter

For equivalent regional tools, refer to Special Tools .

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

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

  1. Place a clean workshop 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:
    4. 3.1. Fill the brake master cylinder reservoir, combined with the hydraulic clutch on the manual gearbox, equipped, to the maximum-fill level with GM approved brake fluid from a clean sealed brake fluid container. If removal of the reservoir cap and diaphragm is necessary, clean the outside of the reservoir on and around the cap prior to removal.
    3.2. 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.

    3.3. Allow a small amount of brake fluid to gravity bleed from the open port of the component.
    3.4. Reconnect the brake pipe to the component and tighten securely.
    3.5. Have an assistant slowly depress the brake pedal fully and maintain steady pressure on the pedal.
    3.6. Loosen the same brake pipe to purge air from the open port of the component.
    3.7. Tighten the brake pipe, then have the assistant slowly release the brake pedal.
    3.8. Wait 15 seconds, then repeat steps 3.3-3.7 until all air is purged from the same port of the component.
    3.9. With the brake pipe installed securely to the master cylinder, proportioning valve assembly, or brake modulator assembly 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.
    3.10. After completing the final component port bleeding procedure, ensure that each of the brake pipe-to-component fittings is properly tightened.
  4. Fill the brake master cylinder reservoir and combined hydraulic clutch, if equipped, to the maximum-fill level with GM approved or equivalent brake fluid from a clean sealed brake fluid container. Clean the outside of the reservoir on and around the reservoir cap prior to removing the cap and diaphragm.
  5. Install the CH-44894-A Brake Pressure Bleeder Adapter to the brake master cylinder reservoir.
  6. Check the brake fluid level in the CH-29532 Diaphragm Type Brake Pressure Bleeder, or equivalent . Add GM approved brake fluid from a clean, sealed brake fluid container as necessary to bring the level to approximately the half-full point.
  7. Connect the CH-29532 Diaphragm Type Brake Pressure Bleeder, or equivalent , to the CH-44894-A Brake Pressure Bleeder Adapter.
  8. Charge the CH-29532 Diaphragm Type Brake Pressure Bleeder, or equivalent , air tank to 175-205 kPa (25-30 psi).
  9. Open the CH-29532 Diaphragm Type Brake Pressure Bleeder, or equivalent , fluid tank valve to allow pressurised brake fluid to enter the brake system.
  10. Wait approximately 30 seconds, then inspect the entire hydraulic brake system in order to ensure that there are no existing external brake fluid leaks.

    11. Any brake fluid leaks identified require repair prior to completing this procedure.

  11. Install a proper ring spanner onto the RIGHT REAR wheel hydraulic circuit bleeder valve.
  12. Install a transparent hose over the end of the bleeder valve.
  13. Submerge the open end of the transparent hose into the transparent container partially filled with GM approved or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.
  14. 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.
  15. 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.
  16. Install a transparent hose over the end of the bleeder valve, then repeat steps 13–14.
  17. 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.
  18. Install a transparent hose over the end of the bleeder valve, then repeat steps 13–14.
  19. 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.
  20. Install a transparent hose over the end of the bleeder valve, then repeat steps 13–14.
  21. After completing the final wheel hydraulic circuit bleeding procedure, ensure that each of the 4 wheel hydraulic circuit bleeder valves is properly tightened.
  22. Close the CH-29532 Diaphragm Type Brake Pressure Bleeder, or equivalent , fluid tank valve, then disconnect the CH-29532 Diaphragm Type Brake Pressure Bleeder, or equivalent , from the CH-44894-A Brake Pressure Bleeder Adapter .
  23. Remove the CH-44894-A Brake Pressure Bleeder Adapter from the brake master cylinder reservoir.
  24. Fill the brake master cylinder reservoir to the maximum-fill level with GM approved brake fluid from a clean, sealed brake fluid container.
  25. Slowly depress and release the brake pedal. Observe the feel of the brake pedal.
  26. If the brake pedal feels spongy perform the following steps:
    27. 26.1. Inspect the brake system for external leaks. Refer to Brake System External Leak Inspection .
    26.2. If equipped with antilock brakes, using a scan tool, perform the antilock brake system automated bleeding procedure to remove any air that may have been trapped in the brake pressure modulator valve (BPMV). Refer to Antilock Brake System Automated Bleed .
  27. Turn the ignition key ON, with the engine OFF. Check to see if the brake system warning lamp remains illuminated.

    28. Note: DO NOT allow the vehicle to be driven until it is diagnosed and repaired.

  28. If the brake system warning lamp remains illuminated, refer to Diagnostic System Check - Vehicle .
   


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