On-Vehicle Inspection [10/2014 - ]: Procedure

INSPECT BRAKE BOOSTER ASSEMBLY

Airtightness check

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TEXT IN ILLUSTRATION

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

If the 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.

Depress the brake pedal while the engine is running, and stop the engine with the brake pedal depressed.
If there is no change in the pedal reserve distance while holding the pedal depressed for 30 seconds, the brake booster assembly is airtight.

Operation check

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

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

If the pedal goes down slightly, operation is normal.