DTC C1400-00: Brake Pressure Leak Malfunction; DTC C140A-00: Pressure Control Reservoir Leak Malfunction [11/2020 - ]: Procedure
- INSPECT WHEEL CYLINDER PRESSURE
Pre-procedure1
- Mount a pedal effort gauge.
- Disconnect the A39 brake booster pump assembly connector.
- Depress the brake pedal 10 times or more until it becomes hard.
HINT:
Depressing the brake pedal with the connector of the brake booster pump assembly disconnected drops the accumulator pressure to approximately 0 MPa.
- Connect an LSPV gauge set.
- Slowly depress the brake pedal and check the wheel cylinder pressure with respect to brake pedal depression force.NOTE:
Check the wheel cylinder pressure with the switching solenoid (SSA, SGH) off and an accumulator pressure of 0 MPa.
Standard Hydraulic Pressure
FOR FRONT RIGHT WHEELBrake Effort
[N (kgf, lbf)]Specified Condition 200 (20.4, 45.0) 0.00 to 2.86 (0.0 to 29.2, 0 to 415) 500 (51.0, 112.4) 1.16 to 5.16 (11.8 to 52.6, 168 to 748) FOR REAR RIGHT WHEELBrake Effort
[N (kgf, lbf)]Specified Condition 200 (20.4, 45.0) 0.00 to 2.86 (0.0 to 29.2, 0 to 415) 500 (51.0, 112.4) 1.16 to 5.16 (11.8 to 52.6, 168 to 748) Result
Proceed to OK NG
Post-procedure1
- None
Result:
NG
See step 5
Result:
OK
See step 2
- CLEAR DTC
Pre-procedure1
- None
Post-procedure1
- Turn the ignition switch off.
Result:
NEXT
See step 3
- RECONFIRM DTC
Pre-procedure1
- Based on the Freeze Frame Data and interview with the customer, attempt to reproduce the conditions when the malfunction occurred.
- Check if the same DTC is output.
Chassis > Brake/EPB > Trouble Codes
Result
Result Proceed to C1400-00 and C140A-00 are not output A C1400-00 or C140A-00 is output B Only C140A-00 is output C
Post-procedure1
- None
Result:
A
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2020 - ]
Result:
B
REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022] , or refer to REMOVAL [12/2022 - 12/2023] , or refer to REMOVAL [12/2023 - ]
Result:
C
See step 4
- RECONFIRM DTC
- Check the DTCs that are output.
Chassis > Brake Booster > Trouble Codes
Result
Result Proceed to C139A-00 is output A DTCs are not output B
Result:
A
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY AND BRAKE ACTUATOR ASSEMBLY
For Brake Booster with Master Cylinder Assembly: Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022] , or refer to REMOVAL [12/2022 - 12/2023] , or refer to REMOVAL [12/2023 - ]
For Brake Actuator Assembly: Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022] , or refer to REMOVAL [12/2022 - 12/2023] , or refer to REMOVAL [12/2023 - ]
Result:
B
REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022] , or refer to REMOVAL [12/2022 - 12/2023] , or refer to REMOVAL [12/2023 - ]
- Check the DTCs that are output.
- INSPECT BRAKE FLUID LEAKS
- Brake fluid leaks and air in brake line inspection
- Check and take a note of the fluid level in the brake master cylinder reservoir assembly (brake booster with master cylinder assembly).
- Repeatedly depress the brake pedal and confirm that the brake pedal feels normal (no air in the system, etc.).
- Check if the brake fluid level in the brake master cylinder reservoir assembly (brake booster with master cylinder assembly) has changed.
- If the brake fluid level has decreased, check for leaks due to damaged brake lines or hoses, loose union nuts, damaged brake master cylinder assembly seals, etc.
OK
There are no brake fluid leaks and no air in the system.
Result
Proceed to OK NG
Result:
OK
REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022] , or refer to REMOVAL [12/2022 - 12/2023] , or refer to REMOVAL [12/2023 - ]
Result:
NG
REPAIR BRAKE FLUID LEAKS AND ADD FLUID
- Brake fluid leaks and air in brake line inspection