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Home >> Lexus >> 2006 >> IS 250 RWD, Standard >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Brakes - Mechanical >> Brake Fluid >> Bleeding

Brake Fluid: Bleeding

HINT:

If any work is performed on the brake system or if air in the brake lines is suspected, bleed the 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 MIN and MAX lines of the reservoir while bleeding the brakes.
  • If brake fluid leaks onto any painted surface, wash off or remove the brake fluid completely.
  1. ADD RESERVOIR WITH BRAKE FLUID
    1. Add reservoir with brake fluid.
      Fig 1: Identifying Reservoir With Brake Fluid
      G04047740Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Fluid: 

      SAE J1703 or FMVSS No. 116 DOT3 

  2. BLEED MASTER CYLINDER 

    HINT:

    • If the master cylinder is reinstalled or if the reservoir becomes empty, bleed the air from the master cylinder.
    • To prevent paint damage due to brake fluid, cover the painted surface with a shop rag or a piece of cloth.
    1. Disconnect the 2 brake lines from the master cylinder.
    2. Slowly depress the brake pedal and hold it (*1).
      Fig 2: Depressing Brake Pedal
      G04047741Courtesy 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.
    5. Using SST, connect the brake lines to the master cylinder.

      SST 09023-00101 

      Torque: 15 N*m (155 kgf*cm, 11 ft.*lbf) 

  3. BLEED BRAKE LINE 
    Fig 3: Releasing Brake Pedal
    G04047742Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    NOTE: Bleed the brake line at the wheel furthest from the master cylinder.
    1. Connect the vinyl tube to the bleeder plug.
    2. Depress the brake pedal several times, then loosen the bleeder plug with the pedal depressed (*3).
      Fig 4: Loosening Bleeder Plug With Pedal Depressed
      G04047743Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. When fluid no longer comes 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. Using SST, tighten the bleeder plug completely.

      SST 09023-00101 

      Torque: 11 N*m (110 kgf*cm, 8 ft.*lbf) 

    6. Repeat the above procedures for each wheel to bleed the air from the brake line.
    Fig 5: Bleeding Brakes
    G04047744Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. BLEED BRAKE ACTUATOR ASSEMBLY 
    NOTE: After bleeding the air from the brake system, if the correct height or feel of the brake pedal cannot be obtained, bleed the air from the brake actuator assembly with the intelligent tester by following the procedures below.
    1. Depress the brake pedal more than 20 times with the engine switch off.
    2. Connect the intelligent tester to the DLC3, then turn the engine switch on (IG).
      NOTE: Do not start the engine.
    3. Turn the intelligent tester power on and select "AIR BLEEDING " on the screen.
      Fig 6: Connecting Intelligent Tester To DLC3
      G04049682Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • Refer to the intelligent tester operator's manual for further details.
      • Bleed the brake actuator assembly by following the steps displayed on the intelligent tester.
    4. Bleed the air from the actuator according to "Step 1: Increase " on the intelligent tester display.
      NOTE: Make sure that the master cylinder reservoir tank does not become empty 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 (*5).
        Fig 7: Depressing Brake Pedal
        G04047746Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. When fluid no longer comes 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.
      5. Using SST, tighten the bleeder plug completely.

        SST 09023-00101 

        Torque: 11 N*m (110 kgf*cm, 8 ft.*lbf) 

      6. Repeat the above procedures for the rest of the wheels to bleed the air from the brake lines.
    5. Bleed the air from the suction line according to "Step 2: Inhalation " on the intelligent tester display.
      Fig 8: Bleeding Brakes
      G04047744Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • Bleed the suction line by following the steps displayed on the intelligent tester.
      • Make sure that the master cylinder reservoir tank does not become empty 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 bleed the air using the intelligent tester (*7).
        NOTE:
        • The operation stops automatically in 4 seconds.
        • At this time, be sure to release the brake pedal.
        Fig 9: Connecting Vinyl Tube To Bleeder Plug
        G04047748Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Check that the operation has stopped by referring to the intelligent tester display and tighten the bleeder plug (*8).
      4. Repeat (*7) and (*8) until all the air in the fluid is completely bled out.
      5. Using SST, tighten the bleeder plug completely.

        SST 09023-00101 

        Torque: 11 N*m (110 kgf*cm, 8 ft.*lbf) 

      6. For the rest of the wheels, bleed the air in the same way as stated in the above procedures.
      Fig 10: Tightening Bleeder Plug
      G04047749Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Bleed the air from the pressure reduction line according to "Step 3: Decrease " on the intelligent tester display.
      NOTE:
      • Bleed the pressure reduction line by following the steps displayed on the intelligent tester.
      • Make sure that the master cylinder reservoir tank does not become empty of brake fluid.
      1. Connect a vinyl tube to either one of the bleeder plugs.
      2. Loosen the bleeder plug (*9).
      3. Using the intelligent tester, operate the brake actuator assembly, completely depress the brake pedal and hold it.
        Fig 11: Loosening Bleeder Plug
        G04047750Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        NOTE:
        • The operation stops automatically after 4 seconds. When this operation will be repeated continuously, allow an interval of at least 20 seconds between each bleeding operation.
        • When the operation is completed, the brake pedal will go down slightly. This is a normal phenomenon due to the opening of the solenoid.
        • During this procedure, the brake pedal will seem heavy. It is necessary to completely depress it, so that brake fluid will come out of 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 steps (*9) to (*10) until all the air in the fluid is completely bled out.
      6. Using SST, tighten the bleeder plug completely.

        SST 09023-00101 

        Torque: 11 N*m (110 kgf*cm, 8 ft.*lbf) 

      7. Repeat the above procedures for the rest of the brakes to bleed the air from the brake line.
    7. Bleed the air from the brake line again according to "Step 4: Increase " on the intelligent tester display.
      Fig 12: Bleeding Brakes
      G04047744Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • Bleed the brake line by following the steps displayed on the intelligent tester.
      • Make sure that the master cylinder reservoir tank does not become empty 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 13: Depressing Brake Pedal
        G04047752Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. When fluid no longer comes out, tighten the bleeder plug, then release the brake pedal (*12).
      4. Repeat (*11) and (*12) until all the air in the fluid is completely bled out.
      5. Using SST, tighten the bleeder plug completely.

        SST 09023-00101 

        Torque: 11 N*m (110 kgf*cm, 8 ft.*lbf) 

      6. Repeat the above procedures for each brake to bleed the air from the brake line.
      Fig 14: Bleeding Brakes
      G04047744Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    8. Finish "AIR BLEEDING " on the intelligent tester and turn off the power.
    9. Disconnect the intelligent tester from the DLC3.
    10. Turn the engine switch off.
  5. INSPECT FLUID LEVEL IN RESERVOIR 
    1. Check the fluid level and add fluid if necessary.

      Fluid: 

      SAE J1703 or FMVSS No. 116 DOT3 

      HINT:

      If fluid leaks, tighten or replace the leaking part.

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