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
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1. |
BRAKE PROBLEM CHECK |
(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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2. |
CHECK DTC AND FREEZE FRAME DATA |
(a) Using the GTS, check DTCs and Freeze Frame Data.
Chassis > Brake Booster > Trouble Codes Chassis > Brake/EPB > Trouble CodesHINT:
- 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.
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Result |
Proceed to |
|---|---|
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DTCs are not output. |
A |
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DTCs are output. |
B |
| B | .gif)
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REPAIR CIRCUITS INDICATED BY OUTPUT DTCS |
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3. |
CHECK BRAKE PEDAL |
(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.
Click here .gif)
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4. |
CHECK VEHICLE CONTROL HISTORY (RoB) (ELECTRONICALLY CONTROLLED BRAKE SYSTEM AND ELECTRIC PARKING BRAKE SYSTEM) |
(a) Using the GTS, check for Vehicle Control History (RoB).
Chassis > Brake Booster > Utility|
Tester Display |
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Vehicle Control History (RoB) |
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Tester Display |
|---|
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Vehicle Control History (RoB) |
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Result |
Proceed to |
|---|---|
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There is no vehicle control history (RoB) for when the electronically controlled brake system and electric parking brake system were suspended. |
A |
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There is vehicle control history (RoB) for when the electronically controlled brake system and/or electric parking brake system were suspended. |
B |
| B |
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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). |
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5. |
INSPECT BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY |
Click here
OK:
The brake booster with master cylinder assembly is normal.
| NG |
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REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY |
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6. |
INSPECT BRAKE ACTUATOR ASSEMBLY |
Click here
OK:
Brake actuator assembly is normal.
| OK |
|
USE SIMULATION METHOD TO CHECK |
| NG |
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REPLACE BRAKE ACTUATOR ASSEMBLY |
READ NEXT:
ABS does not Operate
DESCRIPTION
When the electronically controlled brake system is operating,
as the input piston and output piston are not directly connected, the kickback of
the brake pedal is minimal during ABS o
ABS Operates Before Necessary When Braking
DESCRIPTION
Troubleshooting for when ABS operates too soon due to a noisy
signal from the speed sensor, a difference in output, etc.
PROCEDURE
1.
PERFORM DEALER MODE (SIGNA
VSC does not Operate or VSC does not Operate Correctly
DESCRIPTION
When TRAC or VSC is operating, the skid control ECU (brake actuator
assembly) blinks the slip indicator light to inform the driver that slippage occurred.
When a communication malfunct
SEE MORE:
Outside Vehicle
OUTSIDE VEHICLE
These are maintenance and inspection items that are considered to be the
owner's responsibility.
The owner can do them or they can have them done at a service center.
These items include those that should be checked on a daily basis, those
that in most cases do not
Sensors used by Toyota
Safety Sense 3.0
Various sensors are used to
obtain the necessary information
for system operation.
■ Sensors which detect the
surrounding conditions
Front radar sensor
Front camera
WARNING
■To prevent malfunction of the
radar sensors
Observe the following precautions.
Failure to do so may lead to
a radar
