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Lexus: How to bleed ABS system?


Bleeding the ABS System


ABS system bleeding requires conventional bleeding methods plus use of the DRB scan tool. The procedure involves performing a base brake bleeding, followed by use of the scan tool to cycle and bleed the HCU pump and solenoids. A second base brake bleeding procedure is then required to remove any air remaining in the system.
  1. Perform base brake bleeding.
  2. Connect scan tool to the Data Link Connector (DLC).
  3. Select ANTI-LOCK BRAKES, followed by MISCELLANEOUS, then ABS BRAKES. Follow the instructions displayed. When scan tool displays TEST COMPLETE, disconnect scan tool and proceed.
  4. Perform base brake bleeding a second time.
  5. Top off master cylinder fluid level and verify proper brake operation before moving vehicle.
  1. Bleed the ABS & Traction actuator assembly as follows:


    1. Remove the reservoir cap.

      Click image to see an enlarged view
      Fig. Install SST 09992-00242, 09992-00350 to the reservoir.
    2. Install SST 09992-00242, 09992-00350 to the reservoir.
    3. Connect the vinyl tube to the bleeder plug of the ABS & TRACTION actuator.
    4. Using SST, apply the pressure described to the reservoir. Pressure: 14.2 psi (98.1 kPa)
    5. Loosen the bleeder plug.

      Click image to see an enlarged view
      Fig. Bleed the air out of the ABS & TRACTION actuator.
    6. Bleed the air out of the ABS & TRACTION actuator, tighten the bleeder plug to 74 inch lbs. (8.3 Nm).
    7. Check the fluid level and add fluid if necessary.

Es 330 With Vsc, Is 250 And Is 350




NOTE
After performing the usual air bleeding in the brake system, if the height or feel of the brake pedal cannot be obtained, perform air bleeding in the brake actuator assy with a hand-held tester by following procedures below. Make sure that the brake fluid in the master cylinder reservoir tank does not become empty.

  1. Depress the brake pedal more than 20 times with the engine off.
  2. Connect the hand-held tester to the DLC3, then turn the ignition switch to the ON position.
  3. Do not start the engine.
  4. Select -AIR BLEEDING- on the hand-held tester. Please refer to the Hand-Held Tester Operator-s Manual for further details.
  5. Bleed the air out of the regular brake line in -Step1: Increase- on the hand-held tester display. Perform the air bleeding by following the steps displayed on the hand-held tester. Make sure that the brake fluid in the master cylinder reservoir tank does not become empty.
  6. Connect the vinyl tube to either one of the bleeder plugs.
  7. Depress the brake pedal several times, then loosen the bleeder plug of one of the above wheels with the pedal depressed.
  8. When fluid stops coming out, tighten the bleeder plug, then release the brake pedal.
  9. Repeat (2) and (3) until all air in the fluid is completely bled out.
  10. Tighten the bleeder plug to 73 inch lbs. (8.3 Nm).
  11. Repeat the above procedure to bleed the air out of the brake line for each wheel.
  12. Bleed the air out of the suction line in -Step2: Inhalation- on the hand-held tester display.
  13. Connect the vinyl tube to the bleeder plug at the right front wheel or the right rear wheel and loosen the bleeder plug.
  14. Operate the brake actuator assy using the hand-held tester to bleed the air.
    NOTE
    The operation stops automatically in 4 seconds. At this time, be sure to release the brake pedal.
  15. Check that the operation has stopped, by referring to the hand-held tester display.
  16. Repeat (2) and (3) until all the air in the fluid is completely bled out.
  17. Tighten the bleeder plug.
  18. For the rest of the wheels, bleed the air in the same way as stated in the above procedure.
  19. Bleed the air out of the pressure reduction line in -Step3: Decrease- on the hand-held tester display.
  20. Connect a vinyl tube to either one of the bleeder plugs.
  21. Loosen the bleeder plug.
  22. Using the hand-held tester, operate the brake actuator assy using hand-held tester, completely depress the brake pedal and keep it.
    NOTE
    The operation stops automatically in 4 seconds. When performing this procedure continuously, an interval of at least 20 seconds is required. When the operation is completed, the brake pedal slightly goes down. This is a normal phenomenon caused when the solenoid opens. During this procedure, the pedal seems heavy, but completely depress it so that the brake fluid comes out from the bleeder plug. Be sure to keep depressing the brake pedal. Never depress and release the pedal repeatedly.
  23. Tighten the bleeder plug, then release the brake pedal.
  24. Repeat 3 previous steps until all the air in the fluid is completely bled out.
  25. Tighten the bleeder plug.
  26. Repeat the above procedure to bleed the air out of the brake line for each wheel.
  27. Bleed the air out of the regular brake line again in -Step4: Increase- on the hand-held tester display.
  28. Connect the vinyl tube to either one of the bleeder plug.
  29. Depress the brake pedal several times, then loosen the bleeder plug of one of the above wheels with the pedal depressed.
  30. When fluid stops coming out, tighten the bleeder plug, then release the brake pedal.
  31. Repeat the previous 2 steps until all the air in the fluid is completely bled out.
  32. Tighten the bleeder plug.
  33. Repeat the above procedure to bleed the air out of the brake line for each wheel.


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