Toyota Corolla Cross: Excessive Brake Pedal Travel (No Fluid Leaks and No Air in System)

DESCRIPTION

Depending on the malfunction, the skid control ECU prohibits operation of the electronically controlled brake system to protect components and prevent incorrect operation when DTCs are stored.

If the electronically controlled brake system is disabled, the response of the brake pedal changes and braking performance is reduced.

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.

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(a) Using the GTS, check DTCs and Freeze Frame Data.

HINT:

• If there are currently no warnings and the brake pedal travel is not excessive, DTCs may have been cleared after the system returned to normal.
• If the brake pedal response returned to normal and there are currently no warnings, the system is normal.

B

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

A

(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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(a) Using the GTS, check for Vehicle Control History (RoB).

B

PERFORM TROUBLESHOOTING AND REPAIR REGARDING VEHICLE CONTROL HISTORY (RoB) NOTICE: After performing troubleshooting and repair regarding vehicle control history (RoB), clear the vehicle control history (RoB).

A

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OK:

The brake booster with master cylinder assembly is normal.

NG

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

OK

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OK:

Brake actuator assembly is normal.

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE BRAKE ACTUATOR ASSEMBLY

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