Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001HBK9
Model Year Start: 2020 Model: GR Corolla Prod Date Range: [01/2019 - 09/2022]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model without Electric Parking Brake System): Brake Actuator Operation Sound is Loud during Initial Check; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]

Brake Actuator Operation Sound is Loud during Initial Check

CAUTION / NOTICE / HINT

NOTICE:

After replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and store system information memorization.

Click here 2020 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 03/2019]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model without Electric Parking Brake System): UTILITY 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [03/2019 - 09/2022]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model without Electric Parking Brake System): UTILITY

PROCEDURE

1.

PERFORM ROAD TEST

(a) After turning the ignition switch to ON, compare the operating sound of the brake actuator the first time the vehicle speed reaches 45 km/h (28 mph) with a known good vehicle of the same model.

OK:

The operating sound is the same or quieter than that of a known good vehicle of the same model.

HINT:

When the vehicle speed reaches approximately 40 km/h (25 mph), the initial check of the brake actuator assembly is performed and pump motor operation sounds are generated.

OK

END

NG

2.

CHECK BRAKE ACTUATOR BOLT CUSHION

(a) Check that the cushion of the brake actuator bracket assembly is not worn, damaged or deformed.

OK:

The brake actuator bracket assembly is not worn, damaged or deformed.

NG

REPLACE BRAKE ACTUATOR BOLT CUSHION

OK

3.

ADJUST INSTALLATION OF BRAKE ACTUATOR ASSEMBLY

(a) Drain the brake fluid.

(b) Disconnect all brake lines from the brake actuator assembly.

Click here 2020 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 03/2019]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: BRAKE ACTUATOR (for Gasoline Model): REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [03/2019 - 09/2022]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: BRAKE ACTUATOR (for Gasoline Model): REMOVAL

(c) Connect each brake line so that the cushion of the brake actuator assembly is tensioned evenly.

Click here 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: BRAKE ACTUATOR (for Gasoline Model): INSTALLATION

NOTICE:

After connecting all the brake lines, add brake fluid and bleed the brake system.

Click here 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; BRAKE SYSTEM (OTHER): BRAKE FLUID (for Gasoline Model): BLEEDING

HINT:

By reducing the tension on the brake lines and cushion, the operating sound of the brake actuator assembly may be reduced.

(d) Check that no brake lines interfere the vehicle body or other components.

NEXT

4.

RECHECK SYMPTOM

(a) Perform a road test and check the magnitude of the operating sound again.

OK:

The operating sound is the same or quieter than that of a known good vehicle of the same model.

OK

END

NG

REPLACE BRAKE ACTUATOR ASSEMBLY 2020 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 03/2019]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: BRAKE ACTUATOR (for Gasoline Model): REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [03/2019 - 09/2022]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: BRAKE ACTUATOR (for Gasoline Model): REMOVAL