ELECTRONICALLY CONTROLLED BRAKE SYSTEM(w/ Vacuum Brake Booster) Brake Actuator Operation Sound is Loud during Initial Check

CAUTION / NOTICE / HINT

Note

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information.

Click here

PROCEDURE


  1. PERFORM ROAD TEST


    1. After turning the engine switch on (IG), compare the operating sound of the brake actuator the first time the vehicle speed reaches approximately 6 km/h (4 mph) with a known good vehicle of the same model.

      OK
      The operating sound is the same or quieter than that of a known good vehicle of the same model.

      Tech Tips

      When the vehicle speed reaches approximately 6 km/h (4 mph), the initial check of the brake actuator assembly is performed and pump motor operation sounds are generated.

      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

  2. CHECK BRAKE ACTUATOR BRACKET CUSHION


    1. Check that the cushion of the brake actuator bracket assembly is not worn, damaged or deformed.

      OK
      The brake actuator bracket assembly is not worn, damaged or deformed.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BRAKE ACTUATOR BRACKET CUSHION for LHD: Click here
    REPLACE BRAKE ACTUATOR BRACKET CUSHION for RHD: Click here

    OK

  3. ADJUST INSTALLATION OF BRAKE ACTUATOR ASSEMBLY


    1. Drain the brake fluid.

    2. Disconnect all brake lines from the brake actuator assembly.

      for LHD: Click here

      for RHD: Click here

    3. Connect each brake line so that the cushion of the brake actuator assembly is tensioned evenly.

      for LHD: Click here

      for RHD: Click here

      Note

      After connecting all the brake lines, add brake fluid and bleed the brake system.

      Click here

      Tech Tips

      By reducing the tension on the brake lines and cushion, the operating sound of the brake actuator assembly may be reduced.

    4. Check that no brake lines interfere the vehicle body or other components.

      Result
      Proceed to
      NEXT

    NEXT

  4. RECHECK SYMPTOM


    1. Perform a road test and check the magnitude of the operating sound again.

      OK
      The operating sound is the same or quieter than that of a known good vehicle of the same model.
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY for LHD: Click here
    REPLACE BRAKE ACTUATOR ASSEMBLY for RHD: Click here