Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001XNO2
Model Year Start: 2022 Model: Avalon Prod Date Range: [08/2021 -           ]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model): Brake Actuator Operation Sound is Loud during Initial Check; 2022 MY Avalon [08/2021 -        ]

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 system information memorization.

Click here 2022 MY Avalon [08/2021 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model): CALIBRATION

PROCEDURE

1.

PERFORM ROAD TEST

(a) After turning the engine switch on (IG), 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 2022 MY Avalon [08/2021 -        ]; 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 2022 MY Avalon [08/2021 -        ]; 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 2019 - 2022 MY Avalon [04/2018 -        ]; 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