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Home >> Cadillac >> 2001 >> Catera >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System With Traction Control System >> Bleeding Brake System >> Pressure Bleeding
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Pressure Bleeding

NOTE: Rapid pumping of brake pedal causes master cylinder secondary piston to move into a position that makes bleeding system difficult.
  1. Deplete vacuum reserve from power brake booster by depressing brake pedal several times with engine off. Fill master cylinder reservoir and keep at least half full during bleeding procedure. Reinstall master cylinder reservoir cap. If master cylinder is not suspected of having air in bore, go to step  4 . If master cylinder is known or suspected of having air in bore, go to next step.
  2. Disconnect front EBCM brakeline fitting at master cylinder. Allow fluid to flow from fitting. Tighten fitting to specification. See TORQUE SPECIFICATIONS  . Have an assistant depress brake pedal slowly and hold. Ensure reservoir fluid level is maintained. Again, loosen front EBCM brakeline fitting. Tighten fitting while pedal is still at floor. Release brake pedal slowly. Wait 15 seconds.
  3. Repeat step  2 , including 15 second wait, until fluid is clear and free of air bubbles. Repeat procedure at other (rear most) EBCM brakeline fitting on master cylinder. Master cylinder is now bled. If wheel calipers are not suspected of having air in them, it is not necessary to bleed them.
  4. Fill brake master cylinder reservoir to maximum-fill level. Install brake bleeder to brake master cylinder reservoir. Charge brake bleeder air tank to 25-30 psi (175-205 kPa). Open brake bleeder fluid tank valve to allow pressurized brake fluid to enter brake system. Wait approximately 30 seconds, then inspect entire hydraulic brake system in order to ensure there are no existing external brake fluid leaks. Any brake fluid leaks identified require repair prior to completing this procedure.
  5. Install proper box-end wrench onto right rear wheel hydraulic circuit bleeder valve, then install a transparent hose over end of bleeder valve. Submerge open end of transparent hose into a transparent container partially filled with brake fluid from a clean, sealed brake fluid container. Loosen bleeder valve to purge air from wheel hydraulic circuit; allow fluid to flow until air bubbles stop flowing from bleeder, then tighten bleeder valve.
  6. Repeat step  5 for left rear wheel, then right front wheel and then left front wheel. After completing final wheel hydraulic circuit bleeding procedure, ensure each of 4 wheel hydraulic circuit bleeder valves are properly tightened.
  7. Close pressure bleeder fluid tank valve, then disconnect pressure bleeder. Fill brake master cylinder reservoir to maximum-fill level with DOT-3 brake fluid from a clean, sealed brake fluid container.
  8. Slowly depress and release brake pedal. Observe feel of brake pedal. If brake pedal feels spongy, inspect brake system for external leaks. Using scan tool, perform antilock brake system automated bleeding procedure to remove any air that may have been trapped in BPMV. See AUTOMATED BLEED PROCEDURE  .
  9. Turn ignition on, engine off; ensure brake system warning lamp does not remain illuminated.
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