Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VIY0
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 -           ]
Title: BRAKE SYSTEM (OTHER): BRAKE BOOSTER: ON-VEHICLE INSPECTION; 2016 - 2020 MY Sienna [12/2015 -        ]

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT BRAKE BOOSTER ASSEMBLY

(a) Airtightness check

Text in Illustration

*a

CORRECT

*b

INCORRECT

*c

1st

*d

2nd

*e

3rd

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

HINT:

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

(2) Depress the brake pedal while the engine is running, and stop the engine with the brake pedal depressed.

HINT:

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

(b) Operation check

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

(2) Depress and hold down the pedal, and start the engine.

HINT:

If the pedal goes down slightly, operation is normal.