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Home >> Lexus >> 2007 >> GS 350 RWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Brakes - Mechanical >> BRAKE MASTER CYLINDER (for 3UZ-FE) >> On-Vehicle Inspection

On-Vehicle Inspection

NOTE: A DTC may be stored during the inspection procedure. Be sure to clear the DTC and check that a normal system code is output after the inspection is finished.
  1. INSPECT BRAKE MASTER CYLINDER SUB-ASSEMBLY 
    1. Check battery voltage

      Standard Value: 

      10 to 14 V (while the engine is switched off) 

    2. Connect intelligent tester and pedal effort gauge.
      1. Connect the pedal effort gauge.
      2. Move the shift lever to the P position. Apply the parking brake and connect the intelligent tester to the DLC3.
      3. Turn the engine switch on (IG).
      4. Clear the DTC. (See DTC CHECK / CLEAR )
    3. Check operation w/o brake booster.
      1. Check and adjust brake pedal height. (See ADJUSTMENT )
      2. Check and adjust brake pedal stroke sensor. (See ADJUSTMENT )
      3. Check pedal free play. (See BRAKE PEDAL )
      4. Check pedal reserve distance. (See BRAKE PEDAL )
      5. Turn on the intelligent tester and select "ELECTRONICALLY CONTROLLED BRAKE SYSTEM INVALID" to prohibit the brake control.
      6. Monitor "MAS CYL PRS 1", "MAS CYL PRS 2", "PEDAL STROKE" and "PEDAL STROKE 2" using the intelligent tester.
      7. Check the value output from "MAS CYL PRS 1", "MAS CYL PRS 2", "PEDAL STROKE" and "PEDAL STROKE 2" by depressing the brake pedal.

        Standard Voltage 

        VOLTAGE CHART

        Pedal Effort N (kgf, lbf) MAS CYL PRS 1 (V) MAS CYL PRS 2 (V) PEDAL STROKE (V) PEDAL STROKE 2 (V)
        200 (20.4, 45) 0.75 to 1.05 0.75 to 1.05 1.8 to 2.2 2.8 to 3.2
        500 (51,112) 1.45 to 1.75 1.45 to 1.75 2.05 to 2.45 2.55 to 2.95
      8. Finish the brake control prohibition on the intelligent tester.
  2. INSPECT STROKE SIMULATOR 
    1. Check battery voltage

      Standard Value: 

      10 to 14 V (while the engine is switched off) 

    2. Connect intelligent tester and pedal effort gauge.
      1. Connect the pedal effort gauge.
      2. Move the shift lever to the P position. Apply the parking brake and connect the intelligent tester to the DLC3.
      3. Turn the engine switch on (IG).
      4. Clear the DTC. (See DTC CHECK / CLEAR )
    3. Check operation w/o brake booster.
      1. Check and adjust brake pedal height. (See BRAKE PEDAL )
      2. Check and adjust brake pedal stroke sensor. (See BRAKE PEDAL )
      3. Check pedal free play. (See BRAKE PEDAL )
      4. Check pedal reserve distance. (See BRAKE PEDAL )
      5. Turn on the intelligent tester and select "ELECTRONICALLY CONTROLLED BRAKE SYSTEM INVALID" to prohibit the brake control.
      6. Monitor "MAS CYL PRS 1", "MAS CYL PRS 2", "PEDAL STROKE" and "PEDAL STROKE 2" using the intelligent tester.
      7. Check the value output from "MAS CYL PRS 1", "MAS CYL PRS 2", "PEDAL STROKE" and "PEDAL STROKE 2" by depressing the brake pedal.

        Standard Voltage 

        VOLTAGE CHART

        Pedal Effort N (kgf, lbf) MAS CYL PRS 1 (V) MAS CYL PRS 2 (V) PEDAL STROKE (V) PEDAL STROKE 2 (V)
        200 (20.4, 45) 0.75 to 1.05 0.75 to 1.05 1.8 to 2.2 2.8 to 3.2
        500 (51,112) 1.45 to 1.75 1.45 to 1.75 2.05 to 2.45 2.55 to 2.95
      8. Finish the brake control prohibition on the intelligent tester.
    4. Check operation w/ brake booster
      1. Turn the engine switch on (IG).
      2. Turn on the intelligent tester and monitor the value of "PEDAL STROKE" and "PEDAL STROKE 2".
      3. Depress the brake pedal 4 or 5 times.
      4. Check the value output from "PEDAL STROKE" and "PEDAL STROKE 2" by depressing the brake pedal.

    Standard Voltage 

    VOLTAGE CHART

    Pedal Effort N (kgf, 1lbf) PEDAL STROKE (V) PEDAL STROKE 2 (V)
    50 (5.1 11) 1.4 to 1.8 3.2 to 3.6
    100 (10.2,22) 1.55 to 1.95 3.05 to 3.45
    150 (15.3, 34) 1.65 to 2.05 2.95 to 3.35
    200 (20.4, 45) 1.7 to 2.1 2.9 to 3.3
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