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Home >> Cadillac >> 2021 >> XT5 Sport >> Repair and Diagnosis >> External Pages >> Different car >> Section 686 (Hydraulic Brake System) >> Repair Instructions >> Hydraulic Brake System Bleeding

Hydraulic Brake System Bleeding

WARNING: This page is about a different car, the 2023 GMC Sierra 3500 HD and 2023 GMC Sierra 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

Special Tools

WARNING:

Refer to Brake Fluid Irritant Warning .

CAUTION:

Refer to Brake Fluid Effects on Paint and Electrical Components Caution .

CAUTION:

Only use products that comply with GM specifications and check manufacturer information respectively. We recommend the use of GM genuine products. Instructions must be followed at all times. 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.

  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.
    3. NOTE:

    Clean the outside of the reservoir on and around the reservoir cap prior to removing the cap and diaphragm.

  3. 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 
  4. Install the CH-35589-A  Brake Bleeder Adapter or CH-44894-A  Brake Bleeder Adapter to the brake master cylinder reservoir.
  5. 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 approxiamtely the half-full point. Adhesives, Fluids, Lubricants, and Sealers 
  6. Connect the CH-29532-A  Pressure Brake Bleeder, to the CH-35589-A  Brake Bleeder Adapter or CH-44894-A  Brake Bleeder Adapter.
  7. Charge the CH-29532-A  Pressure Brake Bleeder, air tank to 175 - 205 kPa (25 - 30 psi).
  8. Open the CH-29532-A  Pressure Brake Bleeder, 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. Submerge the open end of the transparent hose into a transparent container partially filled with GM approved brake fluid from a clean, sealed brake fluid container. Adhesives, Fluids, Lubricants, and Sealers 
  13. 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.
  14. 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 REAR wheel hydraulic circuit bleeder valve.
  15. Install a transparent hose over the end of the bleeder valve, then repeat steps 12 - 13.
  16. 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.
  17. Install a transparent hose over the end of the bleeder valve, then repeat steps 12 - 13.
  18. With the right front wheel hydraulic circuit bleeder valve tightened securely, after all air has been purged from the right front hydraulic circuit, install a proper box-end wrench onto the LEFT FRONT wheel hydraulic circuit bleeder valve.
  19. Install a transparent hose over the end of the bleeder valve, then repeat steps 12 - 13.
  20. After completing the final wheel hydraulic circuit bleeding procedure, ensure that each of the 4 wheel hydraulic circuit bleeder valves are properly tightened.
  21. Close the CH-29532-A  Pressure Brake Bleeder, fluid tank valve, then disconnect the CH-29532-A  Pressure Brake Bleeder, from the CH-35589-A  Brake Bleeder Adapter or CH-44894-A  Brake Bleeder Adapter.
  22. Remove the CH-35589-A  Brake Bleeder Adapter or CH-44894-A  Brake Bleeder Adapter from the brake master cylinder reservoir.
  23. 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 
  24. Slowly depress and release the brake pedal. Observe the feel of the brake pedal.
  25. If the brake pedal feels spongy perform the following steps:
    1. Beginning at step 11, repeat the bleed procedure to ensure all air is out of the brake system.
    2. Inspect the brake system for external leaks. Brake System External Leak Inspection 
  26. Turn the ignition key ON, with the engine OFF. Check to see if the brake system warning lamp remains illuminated.
    27. NOTE:

    If the brake system warning lamp remains illuminated, DO NOT allow the vehicle to be driven until it is diagnosed and repaired.

  27. If the brake system warning lamp remains illuminated. Symptoms - Hydraulic Brakes 
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