BRAKE FLUID BLEEDING

CAUTION / NOTICE / HINT

Note


  • Perform air bleeding with park (P) selected and the parking brake applied.

  • Perform air bleeding while maintaining the brake fluid level between the MAX and MIN lines on the brake fluid reservoir.

  • When the No. 2 brake actuator hose (the hose between the brake booster pump assembly and brake master cylinder reservoir assembly) is higher than the fluid level, air enters the hose and brake booster pump assembly while the pump motor is operating and it is difficult to perform air bleeding.

  • When performing air bleeding, the accumulator pressure drop may cause a buzzer to sound. As this is not a malfunction, continue with the air bleeding procedure.

  • If air bleeding is performed, a motor drive permission malfunction or accumulator low pressure DTC may be stored. Clear the DTCs after performing air bleeding or whenever specified by a procedure.

  • Make sure to release the parking brake before performing the linear solenoid valve offset learning and ABS holding solenoid valve learning.

  • Do not allow brake fluid to contact any painted surface. If brake fluid leaks onto any painted surface, immediately wash it off.

  • When performing air bleeding, do not continuously operate the pump motor for more than 100 seconds. If the pump motor is operated for more than 100 seconds, release the brake pedal to stop operation of the pump in order to prevent damage to the pump motor.

  • As brake fluid may overflow from the reservoir when brake fluid is released from the accumulator, do not invert and place the brake fluid bottle on the reservoir filler opening.

  • Do not use vacuum to bleed air from the brake system.*

    Tech Tips

    As the ECB (Electronically Controlled Brake system) contains complicated brake fluid passages, dissolved gases in the brake fluid may form bubbles as the brake fluid pressure decreases.

  • When bleeding air, select the suitable procedure according to the table below.

    Replaced/Installed Item Work Procedure
    Flexible hose (front/rear) Bleed brake line
    Disc brake cylinder assembly (front/rear)
    Brake booster pump assembly Bleed brake system
    Brake booster with master cylinder assembly
    Brake actuator assembly
    Disc brake cylinder assembly (rear) Bleed rear disc brake cylinder assembly

Tech Tips

There are 2 ways of brake line bleeding: using the GTS or not using the GTS.

PROCEDURE


  1. BLEED BRAKE LINE (When Using the GTS)

    Click here

  2. BLEED BRAKE LINE (When Not Using the GTS)

    Click here

  3. BLEED BRAKE SYSTEM

    CAUTION:

    The GTS must be used for bleeding the brake system. If not used, the air bleeding will be incomplete, which is hazardous and may lead to an accident.


    1. Fill the reservoir with brake fluid.


      1. A001PIW

        Remove the brake master cylinder reservoir filler cap assembly.

      2. Add brake fluid to the reservoir until the fluid level is between the MAX and MIN lines on the brake fluid reservoir.

        Brake Fluid
        SAE J1703 or FMVSS No. 116 DOT 3
        SAE J1704 or FMVSS No. 116 DOT 4

    2. Bleed the brake system.


      1. Connect the GTS to the DLC3 and turn the power switch on (IG).

      2. Turn the GTS on and enter the following menus: Chassis / ABS/VSC/TRC / Utility / Air Bleeding/AHB-R Utility.


        Chassis > ABS/VSC/TRC > Utility
        Tester Display
        Air Bleeding/AHB-R Utility

      3. Select "Brake System Air Bleeding", and bleed air from brake fluid following the instructions on the GTS.

        Note

        Before following the instructions on the GTS to perform linear valve offset calibration and ABS solenoid valve offset calibration, release the parking brake. When calibration is complete, immediately apply the parking brake.

      4. After air bleeding, tighten each bleeder plug.

        Torque:
        Front brake
        7.5 N*m  { 76 kgf*cm, 66 in.*lbf }
        Rear brake
        8.3 N*m  { 85 kgf*cm, 73 in.*lbf }

      5. Clear the DTCs.

        Click here

      6. Turn the GTS off then turn the power switch off.

    3. Install the brake master cylinder reservoir filler cap assembly.

    4. Inspect for brake fluid leaks.

  4. BLEED REAR DISC BRAKE CYLINDER ASSEMBLY

    Click here