GM Service Manual Online
For 1990-2009 cars only

Bleeding Procedure

    Notice: Refer to Adding Fluid to the Brake System Notice in the Preface section.


    Object Number: 1265656  Size: SH
  1. Remove the booster reserve by applying the brakes several times with the engine off until all the reserve is depleted.

  2. Object Number: 1265657  Size: SH

    Important: If the master cylinder is known or suspected to have air in the bore, then it must be bled before any wheel cylinder or caliper is bled.

  3. Fill the master cylinder reservoir with brake fluid. Keep the master cylinder reservoir at least one-half full during the bleeding operation.

  4. Object Number: 1265658  Size: SH
  5. Disconnect the brake line at the top of the master cylinder.
  6. Allow the brake fluid to fill the master cylinder until it begins to flow from the port.
  7. Connect the brake line at the top of the master cylinder.

  8. Object Number: 1265656  Size: SH
  9. Slowly push and hold the brake pedal.

  10. Object Number: 1265660  Size: SH
  11. Loosen the brake line at the top of the master cylinder to purge the air from the cylinder.
  12. Tighten the brake line, as in Step 5, and then release the brake pedal slowly. Wait 15 seconds before proceeding to the next step.
  13. Repeat Steps 6-8, including the 15 seconds wait, until all the air is removed from the master cylinder bore.
  14. Notice: Refer to Fastener Notice in the Preface section.

  15. Tighten the brake line fitting.
  16. Tighten
    Tighten the brake line fitting to 16 N·m (12 lb ft).

    Notice: Refer to Brake Fluid Damage to Electrical Connections Notice in the Preface section.


    Object Number: 1265661  Size: SH
  17. After the air has been removed at the top connection, bleed the master cylinder at the side connection in the same manner as with the top connection.

  18. Object Number: 1265662  Size: SH

    Important: For vehicles equipped with a non-antilock braking system, the bleeding sequence is as follows;

    1. right rear
    2. left front
    3. left rear
    4. right front

  19. Attach a transparent tube over the bleeder valve. Allow the tube to hang submerged in the brake fluid in a transparent container.

  20. Object Number: 1265600  Size: SH
  21. Slowly push and hold the brake pedal one time. Avoid rapid pumping of the brake pedal.
  22. Remove the bleeder valve dust cover and loosen the bleeder screw to purge the air from the cylinder.
  23. Tighten the bleeder screw.
  24. Tighten
    Tighten the bleeder screw to 9 N·m (6 lb ft).

  25. Slowly release the brake pedal. Wait 15 seconds before proceeding with the next step.
  26. Repeat Steps 13-16, including the 15 seconds wait, until all the air is removed. It may be necessary to repeat the sequence 10 or more times to remove all the air.
  27. Locate the front bleeder caps.
  28. Proceed to bleed the front brakes following the appropriate sequence, beginning with step 13.
  29. Check the brake pedal for sponginess. Repeat the entire bleeding procedure to correct this condition.
  30. Replace the bleeder valve dust cover.