BMW X3 2005

Bleeding the ABS System


Brake fluid contains polyglycol ethers and polyglycols. Avoid contact with the eyes and wash your hands thoroughly after handling brake fluid. If you do get brake fluid in your eyes, flush your eyes with clean, running water for 15 minutes. If eye irritation persists, or if you have taken brake fluid internally, IMMEDIATELY seek medical assistance.

Clean, high quality brake fluid is essential to the safe and proper operation of the brake system. You should always buy the highest quality brake fluid that is available. If the brake fluid becomes contaminated, drain and flush the system, then refill the master cylinder with new fluid. Never reuse any brake fluid. Any brake fluid that is removed from the system should be discarded. Also, do not allow any brake fluid to come in contact with a painted surface; it will damage the paint.

  1. Remove the reservoir cap and fill the brake reservoir with brake fluid.
  3. Connect a clear plastic tube to the wheel cylinder bleeder plug and insert the other end of the tube into a clear plastic bottle.
  5. Activate pre-charging pump with Diagnosis and Information System (DIS).
  7. Select and operate according to the instructions on the DIS screen:
    You must obey the maximum operating time of the ABS motor to prevent the motor pump from burning.

    Select: Service Functions
    Select: Bleeding ABS/DSC3 Hydraulics

    Click image to see an enlarged view

    Fig. Using a clear plastic tube and bottle at bleeder screw to observe fluid bubbles

  9. Connect bleeder unit to expansion tank and switch on.
  11. Pump the brake pedal several times, and then loosen the bleeder screw until fluid starts to run out without bubbles. Then close the bleeder screw.
  13. Bleed fluid from each wheel until there are no more bubbles exiting with the brake fluid. Run bleeding routine with DIS and bleeder valve open.
  15. Press brake pedal 5 times to the floor; clear and bubble-free brake fluid must flow out.
  17. Close bleeder valve.
  19. Repeat bleeding procedure on each wheel.
  21. After completion of the repair or correction of the problem, erase any stored fault codes.
  23. Disconnect the DIS system.
  25. Fill the brake reservoir with the proper amount of brake fluid.
  27. Check for fluid leaks at all connections.