Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Adjustment

ADJUSTMENT

PROCEDURE

1. INSPECT AND ADJUST BRAKE PEDAL HEIGHT

(a) Remove the front door scuff plate LH.

w/o Rear No. 2 Seat: Click here

w/ Rear No. 2 Seat: Click here

(b) Remove the cowl side trim board LH.

Click here

(c) Remove the No. 1 instrument panel under cover sub-assembly.

Click here

(d) Check the brake pedal height.

HINT:

Inspect and adjust the brake pedal height with the floor carpet folded back.

(1) Measure the shortest distance between the brake pedal pad surface and front floor footrest as shown in the illustration.

Brake Pedal Height from Front Floor Footrest:

151.7 to 161.7 mm (5.97 to 6.37 in.)

If the brake pedal height is not as specified, inspect and adjust the push rod length according to the procedure below.

(e) Adjust the push rod length.

(1) Disconnect the connector from the stop light switch assembly.

*1 Lock Nut *2 Stop Light Switch Assembly Lock Nut *3 Front Floor Footrest *a Brake Pedal Height

(2) Loosen the stop light switch assembly lock nut, and then turn the stop light switch assembly to allow for brake pedal free play.

(3) Loosen the lock nut and adjust the brake pedal height by turning the push rod to achieve the correct height.

Brake Pedal Height from Front Floor Footrest:

151.7 to 161.7 mm (5.97 to 6.37 in.)

(4) Tighten the lock nut.

Torque:

26 N·m {265 kgf·cm, 19 ft·lbf}

(5) Install the stop light switch assembly.

Click here

(f) Install the No. 1 instrument panel under cover sub-assembly.

Click here

(g) Install the cowl side trim board LH.

Click here

(h) Install the front door scuff plate LH.

w/o Rear No. 2 Seat: Click here

w/ Rear No. 2 Seat: Click here

2. INSPECT BRAKE PEDAL FREE PLAY

(a) Stop the engine and firmly depress the brake pedal several times until no vacuum is left in the brake booster assembly.

(b) Depress the brake pedal until a slight resistance is felt. Measure the distance as shown in the illustration. Brake Pedal Free Play: 1.0 to 6.0 mm (0.0394 to 0.236 in.) If the brake pedal free play is not as specified, check the stop light switch clearance. Click here If the brake pedal free play is as specified, proceed to the Inspect Brake Pedal Reserve Distance procedure.

*a Brake Pedal Free Play

3. INSPECT BRAKE PEDAL RESERVE DISTANCE

(a) With the engine running, depress the brake pedal and measure the brake pedal reserve distance as shown in the illustration.

Brake Pedal Reserve Distance from Front Floor Footrest at 490 N (50 kgf, 110.2 lbf):

86 mm (3.39 in.) or more

If the distance is not as specified, troubleshoot the brake system.

Click here