On-Vehicle Inspection [10/2022 - ]: Procedure

1. a. When the ignition switch is turned to ON, check that the ABS warning light, brake system warning light (red indicator), VSC OFF indicator, slip indicator light, downhill assist control indicator light*, brake hold standby indicator light and brake hold operated indicator light come on for approximately 3 seconds.

   HINT: 

   If the warning lights and indicator lights does not illuminate or illuminates for more than approximately 3 seconds, perform troubleshooting for the electronically controlled brake system.

   Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ]

   1. *: for AWD

Pre-procedure1

• Remove the brake master cylinder reservoir filler cap assembly.
• Disconnect the brake fluid level warning switch (brake master cylinder reservoir assembly) connector.

• Measure the resistance according to the value(s) in the table below.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Component without harness connected (Brake Fluid Level Warning Switch (Brake Master Cylinder Reservoir Assembly))

  HINT: 

  A float is located inside the reservoir. Its position changes according to the brake fluid level.

  Standard Resistance

  Tester Connection	Condition	Specified Condition
  A1-1 (+) - A1-2 (E)	Switch off (float up)	10 kΩ or higher
  A1-1 (+) - A1-2 (E)	Switch on (float down)	Below 1 Ω

Post-procedure1

• If there is no problem after finishing the above check, adjust the brake fluid level to the MAX level.

Pre-procedure1

• Disconnect the brake pedal load sensing switch (brake pedal support assembly) connector.

• Measure the resistance according to the value(s) in the table below.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Component without harness connected (Brake Pedal Load Sensing Switch (Brake Pedal Support Assembly))

  Standard Resistance

  Tester Connection	Condition	Specified Condition
  A35-1 (FSW-) - A35-2 (FSW+)	Brake pedal load sensing switch on (Brake pedal released)	203 to 223 Ω
  A35-1 (FSW-) - A35-2 (FSW+)	Brake pedal load sensing switch off (Brake pedal depressed)	950 to 1050 Ω

  NOTE:

  Do not remove the brake pedal load sensing switch from the brake pedal support assembly.

Post-procedure1

• None

1. Airtightness check
   1. Start the engine and stop it after 1 or 2 minutes. Slowly depress the brake pedal several times.

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      *a	Correct
      *b	Incorrect
      *c	1st
      *d	2nd
      *e	3rd

      HINT: 

      If the brake pedal can be depressed nearly to the floor the first time, but on the 2nd and 3rd time cannot be depressed as far, the brake booster assembly is airtight.

   2. Depress the brake pedal with the engine running, and stop the engine with the brake pedal depressed.

      HINT: 

      If there is no change in the brake pedal reserve distance while holding the brake pedal depressed for 30 seconds, the brake booster assembly is airtight.

2. Operation check
   1. Depress the brake pedal several times with the ignition switch off and check that there is no change in the brake pedal reserve distance when the brake pedal is depressed.

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   2. Depress and hold the brake pedal, then start the engine.

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT: 

      If the brake pedal goes down slightly, operation is normal.