Lexus RX300 (MCU15). Service manual — part 163

BR1KG–01

F14026

F14027

F14028

F04932

BR–4

–

BRAKE

BRAKE FLUID

LEXUS RX300 (RM785E)

BRAKE FLUID

BLEEDING

HINT:
If any work is done on the brake system or if air in the brake lines
is suspected, bleed the air from the brake system.
NOTICE:
Do not let brake fluid remain on a painted surface. Wash it
off immediately.

1.

FILL BRAKE RESERVOIR WITH BRAKE FLUID

Check the fluid level in the reservoir after bleeding each wheel.
Add fluid, if necessary.

Fluid: SAE J1703 or FMVSS No. 116 DOT3

2.

BLEED MASTER CYLINDER

HINT:
If the master cylinder has been disassembled or if the reservoir
becomes empty, bleed the air from the master cylinder.
(a)

Disconnect the brake lines from the master cylinder.
SST

09751–36011

(b)

Slowly depress the brake pedal and hold it.

(c)

Block off the outlet plugs with your fingers and release the
brake pedal.

(d)

Repeat (b) and (c) 3 or 4 times.

3.

CONNECT VINYL TUBE TO BRAKE CALIPER BLEED-
ER PLUG

Insert the other end of the tube in a half–full container of brake
fluid.
NOTICE:
Bleed air of the rear brake first. If front brake is bled first,
rear brake air cannot be bled.

F14024

SST

F14025

–

BRAKE

BRAKE FLUID

BR–5

LEXUS RX300 (RM785E)

4.

BLEED BRAKE LINE

(a)

Slowly depress the brake pedal several times.

(b)

While an assistant depresses the pedal, loosen the
bleeder plug until fluid starts to run out. Then tighten the
bleeder plug.

(c)

Repeat this procedure until there are no more air bubbles
in the fluid.
Torque: (Bleeder plug)
8.3 N·m (85 kgf·cm, 74 in.·lbf)

5.

REPEAT PROCEDURE FOR EACH WHEEL

6.

CHECK FLUID LEVEL IN BRAKE RESERVOIR

Check the fluid level and add fluid if necessary.

7.

BLEED BRAKE ACTUATOR

(a)

Remove the reservoir cap.

(b)

Install the SST to the reservoir.
SST

09992–00242, 09992–00350

(c)

Connect the vinyl tube to the bleeder plug of the brake ac-
tuator.

(d)

Using SST, apply the pressure described below to the res-
ervoir.
Pressure: 98.1 kpa (1.0 kgf/cm

2

, 14.2 psi)

(e)

Loosen the bleeder plug.

(f)

Bleed the air from the brake actuator, tighten the bleeder
plug.
Torque: 8.3 N·m (85 kgf·cm, 74 in.·lbf)

8.

CHECK FLUID LEVEL IN RESERVOIR

Check the fluid level and fluid if necessary.

Fluid: SAE J1703 or FMVSS NO. 116 DOT3

F04751

Stop Light Switch

Pedal Height

Push Rod

BR0I7–04

R00935

Pedal Freeplay

F00522

Pedal Reserve Distance

BR–6

–

BRAKE

BRAKE PEDAL

LEXUS RX300 (RM785E)

BRAKE PEDAL

ON–VEHICLE INSPECTION

1.

CHECK PEDAL HEIGHT
Pedal height from asphalt sheet:
LHD: 193.0 – 203.0 mm (7.598 – 7.992 in.)
RHD: 199.0 – 209.0 mm (7.834 – 8.228 in.)

If the pedal height is incorrect, adjust it.
2.

IF NECESSARY, ADJUST PEDAL HEIGHT

(a)

Remove the lower finish panel (See page BO–123).

(b)

Disconnect the connector from the stop light switch.

(c)

Loosen the stop light switch lock nut and remove the stop
light switch.

(d)

Loosen the push rod lock nut.

(e)

Adjust the pedal height by turning the pedal push rod.

(f)

Tighten the push rod lock nut.
Torque: 26 N·m (265 kgf·cm, 19 ft·lbf)

(g)

Install the stop light switch.

(h)

Connect the connector to the stop light switch.

(i)

Push the brake pedal in 5 – 10 mm (0.20 – 0.39 in.), turn
the stop light switch to lock the nut in the position where
the stop light goes off.

(j)

Push the brake pedal in 5 – 10 mm (0.20 – 0.39 in.), check
that stop light lights up.

(k)

After adjusting the pedal height, check the pedal freeplay.

(l)

Install the lower finish panel.

3.

CHECK PEDAL FREEPLAY

(a)

Stop the engine and depress the brake pedal several
times until there is no more vacuum left in the booster.

(b)

Push in the pedal by hand until the resistance begins to
be felt, then measure the distance, as shown.
Pedal freeplay: 1 – 6 mm (0.04 – 0.24 in.)

If incorrect, check the stop light switch clearance. If the clear-
ance is OK, then troubleshoot the brake system.

Stop light switch clearance:
0.5 – 2.4 mm (0.020 – 0.094 in.)

4.

CHECK PEDAL RESERVE DISTANCE

(a)

Release the parking brake.

(b)

With the engine running, depress the brake pedal and
measure the pedal reserve distance, as shown.
Pedal reserve distance from asphalt sheet at 490 N
(50 kgf, 110.2 lbf):
LHD: More than 122 mm (4.80 in.)
RHD: More than 133 mm (5.24 in.)

If the reserve distance is incorrect, troubleshoot the brake sys-
tem.

BR1KH–01

F13363

Lower Finish Panel

z Bushing

Cushion Plate

Clevis Pin

Wave Washer

Brake Pedal

Pedal Pad

Return Spring

Clip

37 (377, 27)

N·m (kgf·cm, ft·lbf) : Specified torque

z Non–reusable part

Lithium soap base glycol grease

Hood Lock Control Release Lever

–

BRAKE

BRAKE PEDAL

BR–7

LEXUS RX300 (RM785E)

COMPONENTS