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Hydraulic Brake System Bleeding (Manual)

    Fig 1: Depressing Brake Pedal
    GM1289915Courtesy of GENERAL MOTORS CORP.
  1. Remove the booster reserve by applying the brakes several times with the engine OFF until all the reserve is depleted.
    2. Fig 2: Filling Master Cylinder With Brake Fluid
    GM1289917Courtesy of GENERAL MOTORS CORP.
    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.
  2. Fill the master cylinder reservoir with brake fluid. Keep the master cylinder at least 1/2 full of fluid during the bleeding operation.
    3. Fig 3: View Of Front Brake Line At Master Cylinder
    GM1289918Courtesy of GENERAL MOTORS CORP.
  3. Disconnect the front brake lines at the master cylinder.
  4. Allow the brake fluid to fill the master cylinder until it begins to flow from the front pipe connector port.
    5. NOTE: Refer to Fastener Notice .
  5. Connect the front brake lines to the master cylinder.

    Tighten:  Tighten the brake lines to 16 N.m (12 lb ft)  .

    6. Fig 4: Depressing Brake Pedal
    GM1289915Courtesy of GENERAL MOTORS CORP.
  6. Slowly push and hold the brake pedal one time.
    7. Fig 5: View Of Front Brake Line At Master Cylinder
    GM1289918Courtesy of GENERAL MOTORS CORP.
  7. Loosen the front brake line at the master cylinder to purge air from the cylinder.
  8. Tighten the brake line as in step 5, and then release the brake pedal slowly. Wait 15 seconds before proceeding to the next step.
  9. Repeat the sequence, including the 15-second wait, until all the air is removed from the master cylinder bore.
    10. Fig 6: Disconnecting/Connecting Brake Lines
    GM1289922Courtesy of GENERAL MOTORS CORP.
    NOTE: Avoid spilling brake fluid on any of the vehicle's painted surfaces, wiring, cables or electrical connectors. Brake fluid will damage paint and electrical connections. If any fluid is spilled on the vehicle, immediately flush the area with water to minimize the potential for damage.
  10. After all the air has been removed at the forward connections, bleed the master cylinder at the rear, cowl, connections in the same manner as with the front connections.
    11. Fig 7: Identifying Bleeder Valve
    GM1289924Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: For vehicles equipped with a non-antilock braking system, the bleeding sequence is as follows: right rear, left rear, left front, and right front.
  11. Attach a transparent tube over the valve. Allow the tube to hang submerged in brake fluid in a transparent container.
    12. Fig 8: Identifying Bleeder Screw
    GM1289925Courtesy of GENERAL MOTORS CORP.
  12. Slowly push and hold the brake pedal one time.
  13. Remove the bleeder valve dust cover and loosen the bleeder screw to purge the air from the cylinder.
  14. Tighten the bleeder screw.

    Tighten:  Tighten the bleeder screw to 8 N.m (71 lb in)  .

  15. Slowly release the brake pedal. Wait 15 seconds before proceeding with the next step.
    16. IMPORTANT: Rapid pumping of the brake pedal pushes the master cylinder secondary piston down the bore in a manner that makes it difficult to bleed the system.
  16. Repeat the sequence, including the 15-second wait, until all the air is removed. It may be necessary to repeat the sequence 10 or more times to remove all the air.
  17. Locate the front bleeder caps.
    18. Fig 9: View Of Brake Bleeding Procedure
    GM1289927Courtesy of GENERAL MOTORS CORP.
  18. Proceed to bleed the front brakes following the appropriate sequence, beginning with step 12.
  19. Inspect the brake pedal for sponginess. Repeat the entire bleeding procedure to correct this condition.
  20. Replace the bleeder valve dust cover.
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