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Brake Fluid: Bleeding

HINT:

If any work is performed on the brake system or if air in the brake lines is suspected, bleed air from the brake system.

NOTE:
  • Move the shift lever to the P position and apply the parking brake before bleeding the brakes.
  • Add brake fluid to keep the level between the MIN and MAX lines of the reservoir while bleeding the brakes.
  • If brake fluid leaks onto any painted surface, immediately wash it off.
  1. FILL RESERVOIR WITH BRAKE FLUID 
    1. Fill the reservoir with brake fluid.

      Fluid: SAE J1703 or FMVSS No. 116 DOT3 

      Fig 1: Filling Reservoir With Brake Fluid
      G05408052Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. BLEED BRAKE MASTER CYLINDER 

    HINT:

    • If the master cylinder is reinstalled or if the reservoir becomes empty, bleed air from the master cylinder.
    • To prevent brake fluid from adhering, cover nearly painted surfaces with a shop rag or a piece of cloth.
    1. Using a union nut wrench (10 mm), disconnect the 2 brake lines from the master cylinder.
      Fig 2: Locating Brake Lines From Master Cylinder
      G05408053Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Slowly depress the brake pedal and hold it (*1).
      Fig 3: Depressing Brake Pedal And Hold
      G05408054Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Cover the 2 outer holes with fingers, and release the brake pedal (*2).
    4. Repeat (*1) and (*2) 3 or 4 times.
      Fig 4: Releasing Brake Pedal
      G05408055Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Using a union nut wrench (10 mm), connect the 2 brake lines to the master cylinder.

      Torque: without union nut wrench 15 N*m (155 kgf*cm, 11 ft.*lbf) 

      with union nut wrench 14 N*m (143 kgf*cm, 10 ft.*lbf) 

      NOTE:
      • Use a torque wrench with a fulcrum length of 250 mm (9.84 in.).
      • This torque value is effective when the union nut wrench is parallel to the torque wrench.
  3. BLEED BRAKE LINE 
    NOTE: Bleed air from the brake line of the wheel farthest from the master cylinder.
    Fig 5: Locating Brake Lines To Master Cylinder
    G05408056Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Connect a vinyl tube to the bleeder plug.
    2. Depress the brake pedal several times, then loosen the bleeder plug with the pedal depressed (*3).
      Fig 6: Depressing Brake Pedal
      G04978292Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. When fluid stops coming out, tighten the bleeder plug, then release the brake pedal (*4).
    4. Repeat (*3) and (*4) until all the air in the fluid is completely bled out.
    5. Tighten the bleeder plug completely.

      Torque: 8.3 N*m (85 kgf*cm, 73 in.*lbf) 

    6. Repeat the above procedures for each wheel to bleed air from the brake line.
      Fig 7: Tightening Bleeder Plug
      G04978293Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. BLEED BRAKE ACTUATOR (w/VSC) 
    NOTE:
    • After bleeding the air from the brake system, if the proper height or feel of the brake pedal cannot be obtained, bleed air from the brake actuator assembly using the Techstream by following the procedure below.
    • Bleed air from the brake line of the wheel farthest from the master cylinder.
    1. Depress the brake pedal more than 20 times with the ignition switch off.
    2. Connect the Techstream to the DLC3, then turn the ignition switch on (IG).
      NOTE: Do not start the engine.
    3. Turn the Techstream on and select "AIR BLEEDING" on the screen.
      NOTE:
      • Refer to the Techstream operator's manual for further details.
      • Perform air bleeding by following the steps displayed on the Techstream.
    4. Perform air bleeding according to "Step 1: Increase" on the Techstream display.
      NOTE: Make sure that the master cylinder reservoir does not run out of brake fluid.
      1. Connect a vinyl tube to one of the bleeder plugs.
      2. Depress the brake pedal several times, then loosen the bleeder plug connected to the vinyl tube with the pedal depressed (*5).
        Fig 8: Depressing Brake Pedal Several Times And Loosen Bleeder Plug
        G04978292Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. When fluid stops coming out, tighten the bleeder plug, then release the brake pedal (*6).
      4. Repeat (*5) and (*6) until all the air in the fluid is completely bled out.
      5. Tighten the bleeder plug completely.

        Torque: 8.3 N*m (85 kgf*cm, 73 in.*lbf) 

      6. Repeat the above procedure for the rest of the wheels to bleed air from each brake line.
        Fig 9: Releasing Brake Pedal
        G04978293Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Bleed air from the suction line according to "Step 2: Inhalation" on the Techstream display.
      NOTE:
      • Bleed the suction line by following the steps displayed on the Techstream.
      • Make sure that the master cylinder reservoir does not run out of brake fluid.
      1. Connect a vinyl tube to the bleeder plug at the right front wheel or the right rear wheel and loosen the bleeder plug.
      2. Operate the brake actuator assembly to perform air bleeding from the suction line using the Techstream (*7).
        NOTE:
        • The operation stops automatically in 4 seconds.
        • At this time, be sure to release the brake pedal.
          Fig 10: Connecting Vinyl Tube To Bleeder Plug
          G04978297Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Check that the operation has stopped by referring to the Techstream display and tighten the bleeder plug (*8).
      4. Repeat (*7) and (*8) until all the air in the fluid is completely bled out.
      5. Tighten the bleeder plug completely.

        Torque: 8.3 N*m (85 kgf*cm, 73 in.*lbf) 

      6. For the rest of the wheels, perform air bleeding in the same way as stated in the above procedure.
        Fig 11: Tightening Bleeder Plug
        G04978298Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Bleed air from the pressure reduction line according to "Step 3: Decrease" on the Techstream display.
      NOTE:
      • Bleed the pressure reduction line by following the steps displayed on the Techstream.
      • Make sure that the master cylinder reservoir does not run out of brake fluid.
      1. Connect a vinyl tube to one of the bleeder plugs.
      2. Loosen the bleeder plug (*9).
      3. Using the Techstream, operate the brake actuator assembly, then completely depress the brake pedal, and hold it.
        Fig 12: Depressing Brake Pedal And Hold
        G04978299Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        NOTE:
        • The operation stops automatically after 4 seconds. When performing this procedure continuously, an interval of at least 20 seconds is required.
        • When the operation is completed, the brake pedal goes down slightly. This is a normal phenomenon 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 the brake pedal depressed. Never depress and release the pedal repeatedly.
      4. Tighten the bleeder plug, then release the brake pedal (*10).
      5. Repeat (*9) to (*10) until all the air in the fluid is completely bled out.
      6. Tighten the bleeder plug completely.

        Torque: 8.3 N*m (85 kgf*cm, 73 in.*lbf) 

      7. Repeat the above procedure for the rest of the brakes to bleed air from each brake line.
        Fig 13: Releasing Brake Pedal
        G04978293Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. Bleed air from the brake line again according to "Step 4: Increase" on the Techstream display.
      NOTE:
      • Bleed air from the suction line by following the steps displayed on the Techstream.
      • Make sure that the master cylinder reservoir does not run out of brake fluid.
      1. Connect a vinyl tube to either one of the bleeder plugs.
      2. Depress the brake pedal several times, then loosen the bleeder plug connected to the vinyl tube with the pedal depressed (*11).
        Fig 14: Depressing Brake Pedal
        G04978299Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. When fluid stops coming out, tighten the bleeder plug, then release the brake pedal
      4. Repeat (*11) and (*12) until all the air in the fluid is completely bled out.
      5. Tighten the bleeder plug completely.

        Torque: 8.3 N*m (85 kgf*cm, 73 in.*lbf) 

      6. Repeat the above procedure for each brake to bleed air from the brake line.
        Fig 15: Releasing Brake Pedal
        G04978293Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    8. Finish "AIR BLEEDING" on the Techstream and turn the Techstream off.
    9. Disconnect the Techstream from the DLC3.
    10. Turn the ignition switch off.
  5. INSPECT FOR FLUID LEAK 
  6. INSPECT FLUID LEVEL IN RESERVOIR 
    1. Check the fluid level and add fluid if necessary.

      Fluid: SAE J1703 or FMVSS No. 116 DOT3 

      If fluid leaks, tighten or replace the leaking part.

      Fig 16: Identifying Fluid Level In Reservoir
      G05408067Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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