ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT BRAKE BOOSTER (a) OPERATING CHECK (1) Depress the brake pedal several times with the engine off and check that there is no change in the pedal reserve distance. (2) Depress the brake pedal and start the engine. If the pedal goes down slightly, operation is normal.
2. CHECK BRAKE VACUUM CHECK VALVE ASSEMBLY (a) Check the check valve. (1) Slide the clip and disconnect the vacuum hose. (2) Remove the check valve from the booster.
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Toyota Tundra Service Manual > Vehicle Stability Control System: Brake Actuator Operation Sound is Loud during Initial Check
CAUTION / NOTICE / HINT NOTICE: When replacing the skid control ECU (brake actuator assembly), perform system variant learning and acceleration sensor zero point calibration. Click here PROCEDURE 1. PERFORM ROAD TEST (a) After turning the ignition switch to ON, compare the operating sound of the bra ...