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Manual Bleeding

  1. Clean areas around reservoir cap on master cylinder. Ensure fluid reservoir is full. Keep reservoir at least half full during procedure. Reinstall reservoir cap. Attach transparent tube to rear bleeder valve on modulator. Submerge other end of tube in clean container partially filled with brake fluid. Slowly open bleeder valve 1/2 - 3/4 turn.
  2. Have an assistant press brake pedal slowly and hold in position until fluid flows from bleeder hose. Close valve. Release brake pedal.
  3. Repeat steps 1) and 2) for front bleeder valve on modulator. See Fig 1 . Refill reservoir to FULL line with DOT 3 brake fluid.
    Fig 1: Locating Modulator Front Bleeder Valve
    G92J05441Courtesy of GENERAL MOTORS CORP.
    NOTE: Before bleeding rear brakes, connect "Scan" tester. Perform SPECIAL TEST, RUN ABS MOTORS, and PISTONS UP-HOME functions.
  4. Connect transparent hose to bleeder fitting at right rear wheel. Submerge other end of hose in container of clean brake fluid.
  5. Loosen bleeder fitting 1/2 - 3/4 turn while an assistant presses brake pedal through its full travel. Tap LIGHTLY on caliper to free trapped air while bleeding. Close bleeder fitting. Release brake pedal. Wait 5 seconds. Repeat procedure until air bubbles are no longer present at submerged end of hose.
  6. Repeat procedure at left front, left rear, and right front wheels. Refill reservoir after each wheel is bled. Refill reservoir to FULL line with DOT 3 brake fluid.
  7. Attach transparent tube to rear bleeder valve on modulator. Submerge other end of tube in clean container partially filled with brake fluid.
  8. Have an assistant press brake pedal with moderate force. Slowly open bleeder valve 1/2 - 3/4 turn. Allow fluid to flow from bleeder hose.
  9. Close valve. Release brake pedal. Wait 5 seconds. Repeat steps 8) and 9) until all air is purged from system.
  10. Repeat steps 7) to 9) for front bleeder fitting on modulator. Refill reservoir to FULL line with DOT 3 brake fluid. Turn ignition on.
  11. Ensure pedal is firm and pedal travel is not excessive. Start engine and repeat this step. If pedal is firm and travel is not excessive, go to step 15). If pedal is not firm or travel is excessive, go to next step.
  12. Use "Scan" tester to RUN ABS MOTORS, PISTONS UP-HOME, and PISTONS DOWN-REL functions 2 times. Using "Scan" tester, command pistons to home position.
  13. Start and run engine for 2 seconds after ABS light goes out. Turn engine off. Repeat this step 9 more times.
  14. Repeat steps 1) through 11).
  15. Check system for leaks with engine running and brakes applied. Road test vehicle. Make several normal stops from moderate speed. Make one or 2 ABS stops from approximately 50 MPH (80 km/h). Repeat steps 1) through 11). If pedal is firm and travel is not excessive, system is properly bled. A second road test is not required.
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