Lexus NX: Bleeding
BLEEDING
CAUTION / NOTICE / HINT
CAUTION:
The Techstream must be used for air bleeding. If not used, the air bleeding will be incomplete, which is hazardous and may lead to an accident.
NOTICE:
- Perform air bleeding with park (P) selected and the parking brake applied.
- As brake fluid may overflow when bleeding, do not place the fluid can on the reservoir filler opening.
- Perform air bleeding while maintaining the brake fluid level between the MIN and MAX lines on the brake fluid reservoir.
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Air bleeding will be difficult if the following occurs:
- The brake actuator hose (the hose between the brake booster pump assembly and brake master cylinder reservoir assembly) is higher than the fluid level and air enters the hose.
- During the air bleeding procedure, air enters the brake booster pump assembly while the pump motor is operating.
- While performing air bleeding, the accumulator pressure drop may cause a buzzer to sound. As there is no problem, continue with air bleeding.
- During air bleeding, DTCs for pressure sensor malfunctions, etc. may be stored. After air bleeding and if instructed in the procedures, clear the DTCs.
- Release the parking brake before performing the linear valve offset calibration procedure.
- Do not allow brake fluid on any painted vehicle body surface. If brake fluid leaks onto any painted surface, immediately wash it off.
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When bleeding air, select the suitable procedure according to the table below.
Replaced/Installed Item
Work Procedure
Flexible hose (front/rear)
Bleed brake line
Disc brake cylinder assembly (front/rear)
Brake booster pump assembly
Bleed brake system
Brake booster with master cylinder assembly
Brake master cylinder reservoir assembly
PROCEDURE
1. BLEED BRAKE LINE
(a) Remove the center No. 1 cowl top ventilator louver.
| (1) Slide the hood to cowl top seal and detach the 2 claws (A). |
|
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(2) Detach the 2 claws (B) and 3 guides, and remove the center No. 1 cowl top ventilator louver.
(b) Bleed brake line.
(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 bleed air from the brake fluid following the instructions on the Techstream.
(6) After air bleeding, tighten each bleeder plug.
Torque:
8.3 N·m {85 kgf·cm, 73 in·lbf}
(7) Clear the DTCs.
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(8) Turn the Techstream off and turn the power switch off.
(c) Inspect for brake fluid leaks.
(d) Install the brake master cylinder reservoir filler cap.
(e) 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. BLEED BRAKE SYSTEM
| (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) Bleed the brake system.
| (1) Wait at least 2 minutes with the power switch off, and disconnect the reservoir level switch connector. HINT: This procedure is not required if the reservoir level switch connector has been disconnected. NOTICE: Do not depress the brake pedal or open/close the doors until the reservoir level switch connector is disconnected. |
|
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(2) Remove the brake master cylinder reservoir filler cap assembly.
(3) 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
(4) Connect the Techstream to the DLC3 and turn the power switch on (IG).
(5) Turn the Techstream on and enter the following menus: Chassis / ABS/VSC/TRAC / Air Bleeding.
Chassis > ABS/VSC/TRAC > Utility| Tester Display |
|---|
| Air Bleeding |
(6) Select "ABS actuator has been replaced", and bleed air from brake fluid following the instructions on the Techstream.
NOTICE:
Before following the instructions on the Techstream to perform linear valve offset calibration, release the parking brake. When calibration is complete, immediately apply the parking brake.
| (7) After air bleeding, tighten each bleeder plug. Torque: Front bleeder plug : 8.3 N·m {85 kgf·cm, 73 in·lbf} Rear bleeder plug : 8.3 N·m {85 kgf·cm, 73 in·lbf} Stroke simulator bleeder plug : 8.5 N·m {87 kgf·cm, 75 in·lbf} HINT: The stroke simulator bleeder plug is positioned as shown in the illustration. |
|
(8) Clear the DTCs.
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(9) Turn the Techstream off and turn the power switch off.
(c) Install the brake master cylinder reservoir filler cap.
(d) Inspect for brake fluid leaks.
| (e) 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). |
|
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