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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 467 (Disc Brakes & Drum Brakes) >> Bleeding Brake System >> Pressure Bleeding

Pressure Bleeding

WARNING: This page is about a different car, the 2002 GMC Safari and 2002 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
  1. Place a clean shop cloth beneath the brake master cylinder to prevent brake fluid spills.
  2. With ignition off and brakes cool, apply brakes 3-5 times, or until 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, you must perform the following steps:
    1. Ensure that brake master cylinder reservoir is full to the maximum fill level. If necessary add DOT-3 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, if cap removal is necessary.
    2. With the rear brake pipe installed securely to the master cylinder, loosen and separate the front brake pipe from the front port of the brake master cylinder.
    3. Allow a small amount of brake fluid to gravity bleed from the open port of the master cylinder.
    4. Reconnect the brake pipe to the master cylinder port 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 master cylinder.
    7. Tighten the brake pipe, then have the assistant slowly release the brake pedal.
    8. Wait 15 seconds, then repeat steps  C- G until all air is purged from the same port of the master cylinder.
    9. With the front brake pipe installed securely to the master cylinder, (after all air has been purged from the front port of the master cylinder), loosen and separate the rear brake pipe from the master cylinder, then repeat steps  C- H .
    10. After completing the final master cylinder port bleeding procedure, ensure that both of the brake pipe-to-master cylinder fittings are properly tightened.
  4. Fill brake master cylinder reservoir to the maximum fill level with DOT-3 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. Remove cap from the metering valve end of the combination valve, then install the Combination Valve Pressure Bleeding Tool (J-39177) to the metering valve.
  6. Using the Combination Valve Pressure Bleeding Tool, depress the shaft of the metering valve to maintain the proper flow of brake fluid to the front wheel hydraulic circuit during the pressure bleeding procedure.
  7. Assemble the Brake Bleeder Adapter Set (J-41618) to the Brake Pressure Bleeder Adapter (J-29567).
  8. Install the Brake Bleeder Adapter Set (J-41618) to the Brake Pressure Bleeder Adapter (J-29567) to the brake master cylinder reservoir.
  9. Check the brake fluid level in the Diaphragm Type Brake Pressure Bleeder (J-29532). Add DOT-3 brake fluid from a clean, sealed brake fluid container as necessary to bring the level to approximately the half-full point.
  10. Connect the pressure bleeder to the brake pressure bleeder adapter.
  11. Charge the pressure bleeder air tank to 25-30 psi (175-205 kPa).
  12. Open pressure bleeder fluid tank valve to allow pressurized brake fluid to enter the brake system.
  13. Wait about 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.
  14. Install a proper box-end wrench onto the RIGHT REAR wheel hydraulic circuit bleeder valve, then install a transparent hose over the end of the bleeder valve.
  15. Submerge the open end of the transparent hose into a transparent container partially filled with DOT-3 brake fluid from a clean, sealed brake fluid container.
  16. 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.
  17. 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, install a transparent hose over the end of the bleeder valve, then repeat steps  15- 16 .
  18. 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, install a transparent hose over the end of the bleeder valve, then repeat steps  15- 16 .
  19. 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, install a transparent hose over the end of the bleeder valve, then repeat steps  15- 16 .
  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 pressure bleeder fluid tank valve, then disconnect the pressure bleeder from the brake pressure bleeder adapter.
  22. Remove brake bleeder adapter set and brake pressure bleeder adapter from the brake master cylinder reservoir.
  23. Remove the combination valve pressure bleeding tool from the metering valve, then install the cap to the metering valve end of the combination valve.
  24. Fill brake master cylinder reservoir to the maximum fill level with DOT-3 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 brake pedal feels spongy perform the following steps: Inspect the brake system for external leaks. See LEAK TEST  under TESTING. Using a scan tool, perform the anti-lock brake system automated bleeding procedure to remove any air that may have been trapped in the BPMV. See appropriate ANTI-LOCK article.
  27. Turn ignition on, with engine off. Check to see if brake system warning light remains illuminated.
  28. If brake system warning light remains illuminated, DO NOT allow vehicle to be driven until problem is diagnosed and repaired. See GENERAL DIAGNOSIS (HYDRAULIC BRAKES)  under TROUBLE SHOOTING.
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