Brake Fluid (For Vacuum Brake Booster) Bleeding


  1. BLEED BRAKE LINE

  2. BLEED BRAKE SYSTEM

Brake Fluid (For Vacuum Brake Booster) -- Bleeding


NOTICE:
  1. Bleed air while adding fluid to maintain the fluid level between the MIN and MAX lines of the reservoir.
  2. Do not allow brake fluid to come into contact with any painted surface. If contact occurs, wash off the fluid immediately.
  3. If bleeding is performed with the engine running or the ignition switch ON, DTC C1441 will be stored. Make sure to clear the DTCs when work is complete (for VSC).
  4. When bleeding air, select the suitable procedure listed below.
    Replaced/Installed Item
    		Work procedure
    Flexible hose (front/rear)
    		Bleed brake line
    Disc brake cylinder assembly (front/rear)
    Brake actuator assembly
    		Bleed brake system
    Brake master cylinder sub-assembly
    Brake master cylinder reservoir assembly
    Brake booster assembly


1. BLEED BRAKE LINE

  1. Remove the brake master cylinder reservoir filler cap assembly.

  1. Add brake fluid until the fluid level is between the MIN and MAX lines of the reservoir.

  1. Loosen the bleeder plug of the front disc brake cylinder RH.

  1. Repeatedly depress the brake pedal and bleed the air from the bleeder plug of the front disc brake cylinder RH.

    NOTICE:
    Add fluid as necessary so that the fluid in the reservoir does not decrease below the MIN level.

  1. After air is completely bled out, tighten the bleeder plug while depressing the brake pedal.

    Torque:
    11 N*m{110 kgf*cm, 8 ft.*lbf}

  1. Bleed the air from the bleeder plug of the front disc brake cylinder LH using the same procedure as for the RH side.

  1. Loosen the bleeder plug of the rear disc brake cylinder RH.

  1. Repeatedly depress the brake pedal and bleed the air from the bleeder plug of the rear disc brake cylinder RH.

    NOTICE:
    Add fluid as necessary so that the fluid in the reservoir does not decrease below the MIN level.

  1. After air is completely bled out, tighten the bleeder plug while depressing the brake pedal.

    Torque:
    11 N*m{110 kgf*cm, 8 ft.*lbf}

  1. Bleed the air from the bleeder plug of the rear disc brake cylinder LH using the same procedure as for the RH side.

  1. Inspect for brake fluid leaks.

  1. Check and adjust the brake fluid level (LandCruiser RM000000SRG05FX_03_0006.html).

  1. Check and clear the DTCs (LandCruiser RM000000XHV0KEX.html for VSC).



2. BLEED BRAKE SYSTEM
CAUTION:
If air is bled without using the intelligent tester, damage or accidents may result. Therefore, always use the intelligent tester when bleeding air.

  1. Remove the brake master cylinder reservoir filler cap assembly.

  1. Add brake fluid until the fluid level is between the MIN and MAX lines of the reservoir.

  1. Using a union nut wrench, disconnect the 2 brake tube from the master cylinder.

  1. Slowly depress and hold the brake pedal.

  1. Block the tube holes with your fingers, and then release the brake pedal.

  1. Remove your fingers, slowly depress and hold the brake pedal, block the tube holes with your fingers again, and then release the brake pedal. Repeat this step 3 or 4 times.

  1. Using a union nut wrench, connect the 2 brake tubes to the brake master cylinder assembly.

    Torque:
    20 N*m{199 kgf*cm, 14 ft.*lbf}
    NOTICE:
    Use the formula to calculate special torque values for situations where a union nut wrench is combined with a torque wrench (LandCruiser RM000003YMD00TX.html).

  1. Loosen the bleeder plug of the front brake cylinder RH.

  1. Repeatedly depress the brake pedal and bleed the air from the bleeder plug of the front brake cylinder RH.

    NOTICE:
    Add fluid as necessary so that the fluid in reservoir does not decrease below the MIN level.

  1. After air is completely bled out, tighten the bleeder plug while depressing the brake pedal.

    Torque:
    11 N*m{110 kgf*cm, 8 ft.*lbf}

  1. Bleed the air from the bleeder plug of the front disc brake cylinder LH using the same procedure as for the RH side.

  1. Loosen the bleeder plug of the rear brake cylinder RH.

  1. Repeatedly depress the brake pedal and bleed the air from the bleeder plug of the rear brake cylinder RH.

    NOTICE:
    Add fluid as necessary so that the fluid in the reservoir does not decrease below the MIN level.

  1. After the air is completely bled out, tighten the bleeder plug while depressing the brake pedal.

    Torque:
    11 N*m{110 kgf*cm, 8 ft.*lbf}

  1. Bleed the air from the bleeder plug of the rear disc brake cylinder LH using the same procedure as for the RH side.

  1. Turn the ignition switch off and connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to on and turn the tester on.

    NOTICE:
    Do not start the engine.

  1. Enter the following menus: Chassis / ABS/VSC/TRC / Utility / Air Bleeding.

  1. Select and run "Inhalation" from the Air Bleeding screen on the intelligent tester.

    NOTICE:
    Follow the prompts on the tester screen to bleed the air for both wheels (front and rear) on the right side.

  1. Loosen the bleeder plug of the right front wheel.*1

  1. Using the intelligent tester, operate the actuator.

    HINT:
    1. To protect the actuator, the operation stops automatically.
    2. Make sure the brake pedal is released.

  1. Check the intelligent tester screen to confirm that the operation stopped.

  1. Tighten the bleeder plug.*2

  1. Repeat the procedures above from *1 to *2 until the air is completely bled out.

  1. Tighten the bleeder plug.

    Torque:
    11 N*m{110 kgf*cm, 8 ft.*lbf}

  1. Bleed the air for the right rear wheel using the same procedure as for the right front wheel.

  1. Select and run "Decrease" from the Air Bleeding screen on the intelligent tester.

    NOTICE:
    Follow the prompts on the tester screen to bleed the air for all 4 wheels.

  1. Loosen the bleeder plug of the right front wheel.*3

  1. Using the intelligent tester, operate the actuator and at the same time fully depress and hold the brake pedal.

    HINT:
    To protect the solenoids, the actuator operation stops automatically in 4 seconds. When operating the actuator repeatedly, follow the prompts on the tester screen and wait for 20 seconds or more between each operation.
    NOTICE:
    1. At this time, the brake pedal becomes difficult to depress. However, be sure to hold the brake pedal in the fully depressed position until brake fluid comes out of the bleeder plug.
    2. Do not repeatedly depress the brake pedal, hold the brake pedal in the fully depressed position.

  1. Tighten the bleeder plug and release the brake pedal.*4

  1. Repeat the procedures above from *3 to *4 until the air in completely bled out.

  1. Tighten the bleeder plug.

    Torque:
    11 N*m{110 kgf*cm, 8 ft.*lbf}

  1. Bleed the air for the other 3 wheels using the same procedure as for the right front wheel.

  1. Repeat the procedure in which air is bled from the brake line by repeatedly depressing the brake pedal.

    NOTICE:
    Repeat this step for each wheel until air is completely bled out.

  1. Inspect for brake fluid leaks.

  1. Inspect fluid level in reservoir (LandCruiser RM000000SRG05FX_03_0006.html).

  1. Check and clear the DTCs (LandCruiser RM000000XHV0KEX.html for VSC).