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Home >> Saturn >> 2003 >> Ion 1 Standard >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Disc Brakes & Drum Brakes >> Bleeding Brake System >> Pressure Bleeding

Pressure Bleeding

  1. Place a clean shop cloth beneath brake master cylinder to catch brake fluid spills.
  2. With ignition OFF and brakes cool, apply brakes 3-5 times or until brake pedal becomes firm to deplete brake booster power reserve.
  3. If you have performed a brake master cylinder bench bleeding, or if you disconnected the brake pipes from master cylinder, or if you have disconnected the brake pipes from the proportioning valve assembly or brake modulator assembly, you must perform the following steps to bleed air at the ports of the hydraulic component:
    1. Ensure that brake master cylinder reservoir is full to the maximum-fill level. If necessary, use DOT-3 brake fluid from a clean, sealed brake fluid container. If removal of reservoir cap and diaphragm is necessary, clean outside of reservoir on and around the cap prior to removal.
    2. With brake pipes installed securely to 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 brake modulator assembly, perform these steps in the sequence of system flow. Begin with fluid feed pipes from master cylinder.
    3. Allow a small amount of brake fluid to gravity bleed from open port of component.
    4. Reconnect brake pipe to component and tighten securely.
    5. Have an assistant slowly depress the brake pedal fully and maintain steady pressure on pedal.
    6. Loosen same brake pipe to purge air from the open port of the component.
    7. Tighten brake pipe, then have the assistant slowly release brake pedal.
    8. Wait 15 seconds, then repeat step  3 until all air is purged from the same port of the component.
    9. With brake pipe installed securely to master cylinder, proportioning valve assembly, or brake modulator assembly, loosen and separate the next brake pipe from the component, then repeat step  3, 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 are properly tightened.
  4. Fill brake master cylinder reservoir to the maximum-fill level with clean DOT-3 brake fluid. Clean outside of the reservoir on and around the reservoir cap prior to removing the cap and diaphragm.
  5. Install Brake Pressure Bleeder Adapter (J-44894-A) to brake master cylinder reservoir.
  6. Check brake fluid level in the Diaphragm Type Brake Pressure Bleeder (J-29532). Add brake fluid as necessary to bring the level to about the half-full point.
  7. Connect pressure bleeder to the brake pressure bleeder adapter.
  8. Charge pressure bleeder air tank to 25-30 psi (175-205 kPa).
  9. Open pressure bleeder fluid tank valve to allow pressurized brake fluid to enter brake system.
  10. Wait about 30 seconds, then inspect entire hydraulic brake system to ensure that there are no existing external brake fluid leaks. Repair any leaks prior to completing this procedure.
  11. Install a box-end wrench 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 a transparent container partially filled with brake fluid.
  14. Loosen bleeder valve to purge air from the wheel hydraulic circuit. Allow fluid to flow until air bubbles stop flowing from the bleeder, then tighten bleeder valve.
  15. With right rear wheel hydraulic circuit bleeder valve tightened securely, install 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 step  13.
  17. With left front wheel hydraulic circuit bleeder valve tightened securely, install 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 step  13.
  19. With left rear wheel hydraulic circuit bleeder valve tightened securely, install 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 step  13.
  21. After completing the final wheel hydraulic circuit bleeding procedure, ensure that each of the 4 wheel hydraulic circuit bleeder valves are properly tightened.
  22. Close pressure bleeder fluid tank valve, then disconnect the pressure bleeder adapter from the pressure bleeder.
  23. Remove pressure bleeder adapter from brake master cylinder reservoir.
  24. Fill brake master cylinder reservoir to the maximum-fill level.
  25. Slowly depress and release brake pedal. Observe the feel of the brake pedal.
  26. If brake pedal feels spongy, inspect brake system for external leaks. On models equipped with anti-lock brakes, perform 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. On all models, turn ignition on, with engine off. Check if brake system warning light remains illuminated.
    28. NOTE: DO NOT allow vehicle to be driven until it is diagnosed and repaired.
  28. If brake system warning light remains illuminated, diagnose problem. See TESTING .
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