Removal [08/2021 - 09/2022]: Procedure

PRECAUTION
NOTE:
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

PERFORM ACCUMULATOR PRESSURE ZERO DOWN

Using the Techstream, perform the accumulator pressure zero down operation.

Connect the Techstream to the DLC3 with the power switch off.
Turn the power switch on (IG).

Turn the Techstream on and enter the following menus: Chassis / ABS/VSC/TRAC / Utility / ECB (Electronically Controlled Brake system) Utility.

Chassis > ABS/VSC/TRAC > Utility

Tester Display
ECB Utility

Select "Motor Invalid" on the "ECB (Electronically Controlled Brake system) Utility" screen.
Perform "Motor Invalid" according to the display on the Techstream.

Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / ECB (Electronically Controlled Brake system) Utility.

Chassis > ABS/VSC/TRAC > Utility

Tester Display
ECB Utility

Select "ECB (Electronically Controlled Brake system) Invalid" on the "ECB (Electronically Controlled Brake system) Utility" screen.
Perform "ECB (Electronically Controlled Brake system) Invalid" according to the display on the Techstream.
Depress the brake pedal 40 times or more to return all the fluid in the accumulator back to the reservoir.
HINT:

A buzzer may sound due to low accumulator pressure. As this is not a malfunction, continue the procedure.
Check that the brake pedal is firm.
NOTE:
If the brake pedal is not firm or the pump motor continues to operate even after depressing the brake pedal 40 times or more, the accumulator pressure zero down operation is not complete.
Turn the Techstream off and turn the power switch off.
Disconnect the Techstream from the DLC3.
Disconnect the cable from the negative (-) auxiliary battery terminal.
Refer to REMOVAL [08/2021 - 09/2022]

When the accumulator pressure zero down could not be performed using the Techstream.

NOTE:

If DTCs are output, the accumulator pressure zero down operation may not be complete. In this case, perform the following procedure.

With the power switch off, release the lock lever and disconnect the brake booster pump assembly connector as shown in the illustration.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

	Release the lock lever
	Disconnect the connector

NOTE:

Be careful not to allow any brake fluid to enter the connector.

Depress the brake pedal 40 times or more to return all the fluid in the accumulator back to the reservoir.
Check that the brake pedal is firm.
NOTE:
If the brake pedal is not firm or the pump motor continues to operate even after depressing the brake pedal 40 times or more, the accumulator pressure zero down operation is not complete.
Disconnect the cable from the negative (-) auxiliary battery terminal.
Refer to REMOVAL [08/2021 - 09/2022]

REMOVE COWL TOP VENTILATOR LOUVER SUB-ASSEMBLY
Refer to REMOVAL [06/2018 - ]

REMOVE FRONT CENTER UPPER SUSPENSION BRACE SUB-ASSEMBLY

Disconnect the connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disengage the 2 clamps and separate the wire harness.

w/ Windshield Deicer System:

Disconnect the connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disengage the 3 clamps and separate the wire harness.

Remove the 6 bolts, 4 nuts and front center upper suspension brace sub-assembly.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DRAIN BRAKE FLUID
NOTE:
If brake fluid leaks onto any painted surface, immediately wash it off.

DISCONNECT ENGINE ROOM MAIN WIRE

Disconnect the connector from the brake booster with master cylinder assembly.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Push the lock arm of the connector to disengage the lock and release the lock lever as shown in the illustration.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Lock Lever
*b	Lock Arm
*c	Push
	Release the lock lever

Using a screwdriver, release the pre-lock and disconnect the connector from the brake booster with master cylinder assembly as shown in the illustration.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Screwdriver Insertion Point
*b	Pre-lock
	Disconnect the connector

NOTE:

Be careful not to allow any brake fluid to enter the connector.

DISCONNECT NO. 1 BRAKE ACTUATOR HOSE

Slide the clip and disconnect the No. 1 brake actuator hose from the brake booster with master cylinder assembly.

DISCONNECT BRAKE LINE

Using a union nut wrench, disconnect the 3 brake lines from the brake booster with master cylinder assembly.

NOTE:

Do not kink or damage the brake lines.
Do not allow any foreign matter such as dirt or dust to enter the brake lines from the connecting parts.

REMOVE NO. 1 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY
Refer to PROCEDURE - Step 15

REMOVE BRAKE PEDAL LINK PIN

Remove the clip and brake pedal link pin.

REMOVE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

Remove the 4 nuts and brake booster with master cylinder assembly.

*a	Skid Control ECU
*b	No. 1 Reservoir Hose
*c	Brake Master Cylinder Push Rod Clevis
*d	Boot
*e	Master Cylinder Reservoir Assembly

NOTE:

Do not kink or damage the brake lines.
Do not carry the brake booster with master cylinder assembly by the parts shown in the illustration.
Be careful not to allow any brake fluid to enter the connector.

REMOVE BRAKE MASTER CYLINDER GASKET