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On-Vehicle Inspection

  1. INSPECT BRAKE MASTER CYLINDER FLUID PRESSURE CHANGE 
    1. Inspect the positive battery voltage.

      Standard voltage: 

      11 to 14 V 

    2. Turn the ignition switch to OFF, and depress the brake pedal more than 20 times.

      HINT:

      When pressure in the accumulator is released, the reaction force becomes lighter and the stroke becomes longer.

    3. Install a LSPV gauge (SST) and brake pedal effort gauge, and bleed the air.

      SST 09709-29018 

    4. When the booster does not operate:
      1. Depress the brake pedal and check the fluid pressure.

        At 245 N (25 kgf, 55 lbf) 

        BRAKE PRESSURE SPECIFICATION

        Front brake pressure Rear brake pressure
        3,150 kPa (32.1 kgf/cm2 , 457 psi) or more 0 kPa (0 kgf/cm2 , 0 psi)

        At 343 N (35 kgf, 77 lbf) 

        BRAKE PRESSURE SPECIFICATION

        Front brake pressure Rear brake pressure
        4,540 kPa (46.3 kgf/cm2 , 659 psi) or more 0 kPa (0 kgf/cm2 , 0 psi)
    5. When the booster operates:
      1. Turn the ignition switch to ON, and wait until the pump motor has stopped (step A).

        HINT:

        Pump operating sound can be heard.

      2. Turn the ignition switch to OFF, and depress the brake pedal more than 20 times (step B).

        HINT:

        When the pressure in the accumulator is released, the reaction force becomes lighter and the stroke becomes longer.

      3. Repeat steps  a and  b 5 times (step C).
      4. Turn the ignition switch to ON, and check that the pump stops after approximately 8 to 14 seconds.
        NOTE: If the pump does not stop, repeat step  c again.
      5. Depress the brake pedal and check the fluid pressure.

        At 49 N (5 kgf, 11 lbf) 

        BRAKE PRESSURE SPECIFICATION

        Front brake pressure Rear brake pressure
        1,120 to 2,320 kPa (11.4 to 23.7 kgf/cm2 , 162 to 337 psi) 1,220 to 2,420 kPa (12.4 to 24.7 kgf/cm2 , 177 to 351 psi)

        At 98 N (10 kgf, 22 lbf) 

        BRAKE PRESSURE SPECIFICATION

        Front brake pressure Rear brake pressure
        3,840 to 5,040 kPa (39.2 to 51.4 kgf/cm2 , 557 to 731 psi) 3,990 to 5,190 kPa (40.7 to 52.9 kgf/cm2 , 579 to 753 psi)

        At 147 N (15 kgf, 33 lbf) 

        BRAKE PRESSURE SPECIFICATION

        Front brake pressure Rear brake pressure
        6,460 to 7,660 kPa (65.9 to 78.1 kgf/cm2 , 937 to 1,111 psi) 6,660 to 7,860 kPa (67.9 to 80.1 kgf/cm2 , 966 to 1,140 psi)

        At 196 N (20 kgf, 44 lbf) 

        BRAKE PRESSURE SPECIFICATION

        Front brake pressure Rear brake pressure
        8,720 to 9,920 kPa (88.9 to 101.2 kgf/cm2 , 1,265 to 1,439 psi) 11,330 to 12,530 kPa (115.5 to 127.8 kgf/cm2 , 1,644 to 1,818 psi)
  2. INSPECT BRAKE MASTER CYLINDER OPERATION 
    1. Inspect the positive battery voltage.

      Standard voltage: 

      11 to 14 V 

    2. Turn the ignition switch to OFF, and depress the brake pedal more than 20 times.

      HINT:

      When pressure in the accumulator is released, the reaction force becomes lighter and the stroke becomes longer.

    3. Check that the brake pedal becomes easy to depress.

      If the pedal does not become easy to depress, check and replace the brake line and hydraulic brake booster.

    4. Turn the ignition switch to ON and check the pump motor operation noise.

      If the pump motor does not operate, check and replace the wire harness and pump motor (see DISASSEMBLY  ).

    5. Connect the Techstream.
      1. Connect the Techstream to the DLC3.
      2. Turn the ignition switch to ON.
      3. Select "ACTIVE TEST" mode on the Techstream.

        HINT:

        • Refer to the Techstream operator article for further details.
        • To protect the solenoids, Techstream turns off automatically 2 seconds after every solenoid has been turned on.
    6. Check the master cylinder solenoid operation.
      Fig 1: Identifying Master Cylinder Solenoid Operation Diagram
      G05112425Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      REFERENCE CHART

      Inspection Order (Step) SOL Selected By Active Test SOL To Be Activated
      D SRCF (SA1) SMCF
      E SRCF & SRCR SREA
      F SFRH SFRH
      G SFLH SFLH
      H SFRR & SFRH SFRR
      I SFLR & SFLH SFLR
      J SRMF (SMCF, SA3) SREC
      K SRMR (SMCR, STR) STR
      L SRRH SRRH
      M SRLH SRLH
      N SRH & SRR SRRR
      O SRLR & SRLH SRLR
    7. Prepare the vehicle.
      1. Jack up and support the vehicle.
      2. Release the parking brake lever.
      3. Shift the shift lever to the "N" position and check that the rear wheels rotate by hand.
    8. Inspect front VSC solenoid (SMCF) operation (step D).

      HINT:

      • ON: Activate SMCF and check that the brake pedal cannot be depressed (the pedal feels tight).
      • OFF: Deactivate SMCF and check that the brake pedal can be depressed.
      1. Select "SRCF (SA1)" on the Techstream.
      2. Turn the "SRCF (SA1)" on by the Techstream, then depress the brake pedal with stable force and check that the pedal cannot be depressed. If the pedal can be depressed, replace the hydraulic brake booster.

        HINT:

        To protect the solenoids, the Techstream turns off automatically 2 seconds after every solenoid has been turned on.

        NOTE: When operating it continuously, set the interval of more than 20 seconds.
      3. Release the brake pedal.
      4. When the solenoid is off, depress the brake pedal again and check that the brake pedal can be depressed.

        If the pedal cannot be depressed, replace the hydraulic brake booster.

    9. Inspect front VSC solenoid (SREA) operation (step E).

      HINT:

      • ON: Activate SMCF and SREA, depress the brake pedal, and then check that the front wheels do not rotate.
      • OFF: Deactivate SMCF and SREA. Reactivate SMCF, depress the brake pedal, and then check that the front wheels rotate.
      1. Select "SRCF & SRCR" on the Techstream.
      2. Turn the "SRCF & SRCR" on by the Techstream, then depress the brake pedal with stable force.
      3. When the solenoids are on, check that the front wheels do not rotate by hand.

        If the front wheels rotate, replace the hydraulic brake booster.

        HINT:

        • To protect the solenoids, the Techstream turns off automatically 2 seconds after every solenoid has been turned on.
        • When rotating the wheels fast, the fail-safe function is activated and judgement cannot be made properly. So rotate the wheels as slowly as possible.
        NOTE: When operating it continuously, set the interval of more than 20 seconds.
      4. When the solenoids are off, turn the "SRCF (SA1)" on by the intelligent, then depress the brake pedal and check the front wheels by rotating them by hand.

        If the front wheels stop, replace the hydraulic brake booster.

      5. When the "SRCF (SA1)" is off, depress the brake pedal again and check that the brake pedal can be depressed.

        If the pedal cannot be depressed, replace the hydraulic brake booster.

    10. Inspect front ABS solenoid (SFRH) operation (step F).

      HINT:

      • ON: Activate SFRH, depress the brake pedal, and then check that the right front wheel rotates.
      • OFF: Deactivate SFRH, depress the brake pedal, and then check that the right front wheel does not rotate.
      1. Select "SFRH" on the Techstream.
      2. Turn the "SFRH" on by the Techstream, then depress the brake pedal with stable force.
      3. When the solenoid is on, check the right front wheel by rotating it by hand.

        If the right front wheel stops, replace the hydraulic brake booster.

        HINT:

        • To protect the solenoid, the Techstream turns off automatically 2 seconds after every solenoid has been turned on.
        • When rotating the wheel fast, the fail-safe function is activated and judgement cannot be made properly. So rotate the wheel as slowly as possible.
        NOTE: When operating it continuously, set the interval of more than 20 seconds.
      4. When the solenoid is off, depress the brake pedal again and check that the right front wheel does not rotate by hand.

        If the right front wheel rotates, replace the hydraulic brake booster.

    11. Inspect front ABS solenoid (SFLH) operation (step G).

      HINT:

      • ON: Activate SFLH, depress the brake pedal, and then check that the left front wheel rotates.
      • OFF: Deactivate SFLH, depress the brake pedal, and then check that the left front wheel does not rotate.
      1. Select "SFLH" on the Techstream.
      2. Turn the "SFLH" on by the Techstream, then depress the brake pedal with stable force.
      3. When the solenoid is on, check the left front wheel by rotating it by hand.

        If the left front wheel stops, replace the hydraulic brake booster.

        HINT:

        • To protect the solenoid, the Techstream turns Off automatically 2 seconds after every solenoid has been turned on.
        • When rotating the wheel fast, the fail-safe function is activated and judgement cannot be made properly. So rotate the wheel as slowly as possible.
        NOTE: When operating it continuously, set the interval of more than 20 seconds.
      4. When the solenoid is off, depress the brake pedal again and check that the left front wheel does not rotate by hand.

        If the left front wheel rotates, replace the hydraulic brake booster.

    12. Inspect front ABS solenoid (SFRR) operation (step H).

      HINT:

      • ON: Depress the brake pedal, activate SFRR and SFRH, and then check that the right front wheel rotates.
      • OFF: Deactivate SFRR and SFRH, depress the brake pedal, and then check that the right front wheel does not rotate.
      1. Select "SFRR' & SFRH" on the Techstream.
      2. Depress the brake pedal with stable force, then turn the "SFRR & SFRH" on by the Techstream.
      3. When the solenoids are on, check the right front wheel by rotating it by hand.

        If the right front wheel stops, replace the hydraulic brake booster.

        HINT:

        • To protect the solenoids, the Techstream turns off automatically 2 seconds after every solenoid has been turned on.
        • When rotating the wheel fast, the fail-safe function is activated and judgement cannot be made properly. So rotate the wheel as slowly as possible.
        NOTE: When operating it continuously, set the interval of more than 20 seconds.
      4. When the solenoids are off, depress the brake pedal again and check that the right front wheel does not rotate by hand.

        If the right front wheel rotates, replace the hydraulic brake booster.

    13. Inspect front ABS solenoid (SFLR) operation (step I).

      HINT:

      • ON: Depress the brake pedal, activate SFLR and SFLH, and then check that the left front wheel rotates.
      • OFF: Deactivate SFLR and SFLH, depress the brake pedal, and then check that the left front wheel does not rotate.
      1. Select "SFLR & SFLH" on the Techstream.
      2. Depress the brake pedal with stable force, then turn the "SFLR & SFLH" on by the Techstream.
      3. When the solenoids are on, check the left front wheel by rotating it by hand.

        If the left front wheel stops, replace the hydraulic brake booster.

        HINT:

        • To protect the solenoids, the Techstream turns off automatically 2 seconds after every solenoid has been turned on.
        • When rotating the wheel fast, the fail-safe function is activated and judgement cannot be made properly. So rotate the wheel as slowly as possible.
        NOTE: When operating it continuously, set the interval of more than 20 seconds.
      4. When the solenoids are off, depress the brake pedal again and check that the left front wheel does not rotate by hand.

        If the left front wheel rotates, replace the hydraulic brake booster.

    14. Inspect rear VSC solenoid (SREC) operation (step J).

      HINT:

      • ON: Depress the brake pedal, and activate SREC. Release the brake pedal and check that the rear wheels do not rotate.
      • OFF: Deactivate SREC and check that the rear wheels rotate.
      1. Select "SRMF (SMCF, SA3)" on the Techstream.
      2. Depress the brake pedal with stable force, then turn the "SRMF (SMCF, SA3)" on by the Techstream.
      3. Release the brake pedal when the solenoid is on, and check that the rear wheels do not rotate by hand.

        If the rear wheels rotate, replace the hydraulic brake booster.

        HINT:

        • To protect the solenoids, the Techstream turns off automatically 2 seconds after every solenoid has been turned on.
        • When rotating the wheels fast, the fail-safe function is activated and judgement cannot be made properly. So rotate the wheels as slowly as possible.
        NOTE: When operating it continuously, set the interval of more than 20 seconds.
      4. When the solenoid is off, check the rear wheels by rotating them by hand.

        If the rear wheels stop, replace the hydraulic brake booster.

    15. Inspect rear VSC solenoid (STR) operation (step K).

      HINT:

      • ON: Activate STR, depress the brake pedal, and then check that the rear wheels rotate.
      • OFF: Deactivate STR, depress the brake pedal, and then check that the rear wheels do not rotate.
      1. Select "SRMR (SMCR, STR)" on the Techstream.
      2. Turn the "SRMR (SMCR, STR) on by the Techstream.
      3. When the solenoid is on, check that the rear wheels rotate by hand.

        If the rear wheels do not rotate, replace the hydraulic brake booster.

        HINT:

        • To protect the solenoids, the Techstream turns off automatically 2 seconds after every solenoid has been turned on.
        • When rotating the wheels fast, the fail-safe function is activated and judgement cannot be made properly. So rotate the wheels as slowly as possible.
        NOTE: When operating it continuously, set the interval of more than 20 seconds.
      4. When the "SRMR (SMCR, STR)11 is off, depress the brake pedal again and check that the rear wheels do not rotate by hand.

        If the rear wheels rotate, replace the hydraulic brake booster.

    16. Inspect rear ABS solenoid (SRRH) operation (step L).

      HINT:

      • ON: Activate SRRH, depress the brake pedal, and then check that the right rear wheel rotates.
      • OFF: Deactivate SRRH, depress the brake pedal, and then check that the right rear wheel does not rotate.
      1. Select "SRRH" on the Techstream.
      2. Turn the "SRRH" on by the Techstream, then depress the brake pedal with stable force.
      3. When the solenoid is on, check the right rear wheel by rotating it by hand.

        If the right rear wheel stops, replace the hydraulic brake booster.

        HINT:

        • To protect the solenoids, the Techstream turns off automatically 2 seconds after every solenoid has been turned on.
        • When rotating the wheel fast, the fail-safe function is activated and judgement cannot be made properly. So rotate the wheel as slowly as possible.
        NOTE: When operating it continuously, set the interval of more than 20 seconds.
      4. When the solenoid is off/depress the brake pedal again and check that the right rear wheel does not rotate by hand.

        If the right rear wheel rotates, replace the hydraulic brake booster.

    17. Inspect rear ABS solenoid (SRLH) operation (step M).

      HINT:

      • ON: Activate SRLH, depress the brake pedal, and then check that the left rear wheel rotates.
      • OFF: Deactivate SRLH, depress the brake pedal, and then check that the left rear wheel does not rotate.
      1. Select "SRLH" on the Techstream.
      2. Turn the "SRLH" on by the Techstream, then depress the brake pedal with stable force.
      3. When the solenoid is on, check the left rear wheel by rotating it by hand.

        If the left rear wheel stops, replace the hydraulic brake booster.

        HINT:

        • To protect the solenoid, the Techstream turns off automatically 2 seconds after every solenoid has been turned on.
        • When rotating the wheel fast, the fail-safe function is activated and judgement cannot be made properly. So rotate the wheel as slowly as possible.
        NOTE: When operating it continuously, set the interval of more than 20 seconds.
      4. When the solenoid is off, depress the brake pedal again and check that the left rear wheel does not rotate by hand.

        If the left rear wheel rotates, replace the hydraulic brake booster.

    18. Inspect rear ABS solenoid (SRRR) operation (step N).

      HINT:

      • ON: Depress the brake pedal, activate SRRH and SRRR, and then check that the right rear wheel rotates.
      • OFF: Deactivate SRRH and SRRR, depress the brake pedal, and then check that the right rear wheel does not rotate.
      1. Select "SRH & SRR" on the Techstream.
      2. Depress the brake pedal with stable force, then turn the "SRH & SRR" on by the Techstream.
      3. When the solenoids are on, check the right rear wheel by rotating it by hand.

        If the right rear wheel stops, replace the hydraulic brake booster.

        HINT:

        • To protect the solenoids, the Techstream turns off automatically 2 seconds after every solenoid has been turned on.
        • When rotating the wheel fast, the fail-safe function is activated and judgement cannot be made properly. So rotate the wheel as slowly as possible.
        NOTE: When operating it continuously, set the interval of more than 20 seconds.
      4. When the solenoids are off, depress the brake pedal again and check that the right rear wheel does not rotate by hand.

        If the right rear wheel rotates, replace the hydraulic brake booster.

    19. Inspect rear ABS solenoid (SRLR) operation (step O).

      HINT:

      • ON: Depress the brake pedal, activate SRLR and SRLH, and then check that the left rear wheel rotates.
      • OFF: Deactivate SRLR and SRLH, depress the brake pedal, and then check that the left rear wheel does not rotate.
      1. Select "SRLR & SRLH" on the Techstream.
      2. Depress the brake pedal with stable force, then turn the "SRLR & SRLH" on by the Techstream.
      3. When the solenoids are on, check the left rear wheel by rotating it by hand.

        If the left rear wheel stops, replace the hydraulic brake booster.

        HINT:

        • To protect the solenoids, the Techstream turns off automatically 2 seconds after every solenoid has been turned on.
        • When rotating the wheel fast, the fail-safe function is activated and judgement cannot be made properly. So rotate the wheel as slowly as possible.
        NOTE: When operating it continuously, set the interval of more than 20 seconds.
      4. When the solenoids are off, depress the brake pedal again and check that the left rear wheel does not rotate by hand.

        If the left rear wheel rotates, replace the hydraulic brake booster.

    20. Lower the vehicle.
    21. Disconnect the Techstream.
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