Lexus NX: Replacement

Lexus NX Service Manual / Brake / Brake System (other) / Brake Fluid / Replacement

REPLACEMENT

CAUTION / NOTICE / HINT

HINT:

There are 2 methods for brake fluid replacement: using the Techstream or not using the Techstream.

NOTICE:

Perform fluid replacement with park (P) selected and the parking brake applied.
As brake fluid may overflow when replacing brake fluid, do not place the fluid can on the reservoir filler opening.
Perform fluid replacement while maintaining the brake fluid level between the MIN and MAX lines on the brake fluid reservoir.
Replacing brake fluid will be difficult if the following occurs:
1. The brake actuator hose (the hose between the brake booster pump and brake fluid reservoir) is lowered into the fluid and air enters the hose.
2. During the fluid replacement procedure, air enters the brake booster pump while operating the pump motor.
While performing fluid replacement, the accumulator pressure drop may cause a buzzer to sound. As there is no problem, continue with the fluid replacement.
During fluid replacement, DTCs for pressure sensor malfunctions, etc. may be stored. After fluid replacement and if instructed in the procedures, clear the DTCs.
Do not allow brake fluid to adhere to any painted surface such as the vehicle body. If brake fluid leaks onto any painted surface, immediately clean it off.

PROCEDURE

1. REPLACE BRAKE FLUID (When Using the Techstream)

NOTICE:

Add brake fluid carefully and check that the reservoir level remains between the MIN and MAX lines.
Do not stand the fluid can on the reservoir inlet. Doing so will cause brake fluid to overflow.

(a) Remove the center No. 1 cowl top ventilator louver.

(1) Slide the hood to cowl top seal and detach the 2 claws (A).

(2) Detach the 2 claws (B) and 3 guides, and remove the center No. 1 cowl top ventilator louver.

(b) Replace brake fluid.

(1) Remove the brake master cylinder reservoir filler cap assembly.

(2) Add brake fluid to keep the level between the MIN and MAX lines of the reservoir.

Brake fluid:

SAE J1703 or FMVSS No. 116 DOT 3

(3) Connect the Techstream to the DLC3 and turn the power switch on (IG).

(4) Turn the Techstream on and enter the following menus: Chassis / ABS/VSC/TRAC / Air Bleeding.

Chassis > ABS/VSC/TRAC > Utility

Tester Display
Air Bleeding

(5) Select "Usual air bleeding", and replace the brake fluid following the instructions on the Techstream.

HINT:

It is not necessary to disconnect the reservoir level switch connector.

(6) After replacing the brake fluid, tighten each bleeder plug.

Torque:

8.3 N·m {85 kgf·cm, 73 in·lbf}

Click here

(d) Turn the Techstream off and turn the power switch off.

(e) Inspect for brake fluid leaks.

(f) Install the brake master cylinder reservoir filler cap.

(g) Install the center No. 1 cowl top ventilator louver.

(1) Attach the 2 claws (B) and 3 guides to install the center No. 1 cowl top ventilator louver.

(2) Slide the hood to cowl top seal to attach the 2 claws (A).

2. REPLACE BRAKE FLUID (When not Using the Techstream)

NOTICE:

Performing the following procedure will select ECB (Electronically Controlled Brake system) Invalid Mode without using the Techstream.
ECB (Electronically Controlled Brake system) Invalid Mode allows the brake fluid to be replaced without using the Techstream.
The brake warning light / yellow will blink to indicate when ECB (Electronically Controlled Brake system) Invalid Mode is selected.
Be sure to check that the brake warning light / yellow is blinking while replacing the brake fluid.

When one of the following conditions is met, ECB (Electronically Controlled Brake system) Invalid Mode is canceled, and then DTCs may be stored. Therefore, do not cancel the ECB (Electronically Controlled Brake system) Invalid Mode while replacing brake fluid.

The shift lever is used to select any other state from park (P).

The power switch is turned on (READY).

The power switch is turned off.

The parking brake is released.

The vehicle speed is not 0 km/h (0 mph).

Do not rotate the brake disc while ECB (Electronically Controlled Brake system) Invalid Mode is selected.
When replacing the brake fluid from the brake line, do not depress the brake pedal to operate the brake booster pump assembly more than 100 seconds. If the brake booster pump assembly is operated more than 100 seconds, ECB (Electronically Controlled Brake system) Invalid Mode is automatically finished and DTCs may be stored.
Add brake fluid carefully and check that the fluid level remains between the MIN and MAX lines on the brake fluid reservoir.
As brake fluid may overflow when replacing brake fluid, do not place the fluid can on the reservoir filler opening.

(a) Remove all 4 wheels.

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(b) Select ECB (Electronically Controlled Brake system) Invalid Mode.

(1) Perform the procedure listed below in 1 minute.

Turn the power switch on (IG) with park (P) selected and parking brake applied.
Move the shift lever to N and then depress the brake pedal more than 8 times within 5 seconds.
Move the shift lever to P and then depress the brake pedal more than 8 times within 5 seconds.
Move the shift lever to N and then depress the brake pedal more than 8 times within 5 seconds.
Move the shift lever to P.

(2) Check that the brake warning light / yellow is blinking.

*a	Brake Warning Light / Yellow

(1) Slide the hood to cowl top seal and detach the 2 claws (A).

(2) Detach the 2 claws (B) and 3 guides, and remove the center No. 1 cowl top ventilator louver.

(d) Replace the brake fluid.

(1) Remove the brake master cylinder reservoir filler cap assembly.

(2) Add brake fluid to keep the level between the MIN and MAX lines of the reservoir.

Brake fluid:

SAE J1703 or FMVSS No. 116 DOT 3

(3) Connect a vinyl tube to the bleeder plug of the front disc brake cylinder assembly RH.

(4) Depress the brake pedal several times, and then loosen the bleeder plug with the pedal depressed.*1

(5) When fluid stops coming out, tighten the bleeder plug, and then release the brake pedal.*2

(6) Repeat *1 and *2 until all the air in the brake fluid is completely bled out and the new brake fluid comes out.

(7) Tighten the bleeder plug completely.

Torque:

8.3 N·m {85 kgf·cm, 73 in·lbf}

(8) Replace the brake fluid from the front disc brake cylinder assembly LH using the same procedure as for RH.

(9) Connect a vinyl tube to the bleeder plug of the rear disc brake cylinder assembly LH.

(10) Loosen the bleeder plug while depressing and holding the brake pedal, and replace the brake fluid while the brake booster pump assembly and solenoid are running. *3

NOTICE:

Be sure to keep the brake pedal depressed.
Do not depress the brake pedal to operate the brake booster pump for more than 100 seconds. When performing this procedure continuously, release the brake pedal to stop the brake booster pump from operating and depress the brake pedal again.

(11) Tighten the bleeder plug, then release the brake pedal.*4

(12) Repeat steps *3 and *4 until all the air in the brake fluid is completely bled out and the new brake fluid comes out.

(13) Tighten the bleeder plug completely.

Torque:

8.3 N·m {85 kgf·cm, 73 in·lbf}

(14) Replace the brake fluid from the rear disc brake cylinder assembly RH using the same procedure as for LH.

(15) Turn the power switch off.

(e) Inspect for brake fluid leaks.

(f) Adjust the brake fluid level in the reservoir.

Click here

(g) Install the brake master cylinder reservoir filler cap.

(h) Install the center No. 1 cowl top ventilator louver.

(1) Attach the 2 claws (B) and 3 guides to install the center No. 1 cowl top ventilator louver.

(2) Slide the hood to cowl top seal to attach the 2 claws (A).

(i) Install the 4 wheels.

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