DESCRIPTION

Depending on the malfunction, the skid control ECU (brake booster with master cylinder assembly) prohibits operation of the electronically controlled brake system to protect components and prevent incorrect operation when DTCs are stored.

If the switching solenoid is disabled due to prohibition of the electronically controlled brake system, the response of the brake pedal changes and braking performance is reduced.

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake booster with master cylinder assembly), perform initialization and calibration of the linear solenoid valve.

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PROCEDURE

(a) Check the conditions at the time the problem occurred.

(1) Whether a warning light illuminated or the buzzer sounded.

(2) Road surface condition when the problem occurred and just before the problem occurred.

(3) When the problem occurred and how many times the brake pedal was depressed before the problem occurred.

(4) Frequency of the abnormal brake pedal response.

NEXT

(a) While depressing the brake pedal by hand, check the installation condition of the brake pedal stroke sensor assembly and brake pedal, and check for mechanical malfunctions.

(b) Check and adjust the brake pedal height.

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NEXT

(a) Check the brake booster with master cylinder assembly.

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OK:

The brake booster with master cylinder assembly is normal.

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY