Lexus RX300 (MCU15). Service manual - part 169

F03521

SST

Gasket

R11347

SST

BR–28

–

BRAKE

BRAKE BOOSTER ASSEMBLY

LEXUS RX300   (RM785E)

3.

RHD except for Europe:
ADJUST LENGTH OF BOOSTER PUSH ROD

(a)

Install a new gasket on the master cylinder.

(b)

Set the SST on the gasket, and lower the pin until its tip
slightly touches the piston.
SST

09737–00010

(c)

Turn the SST upside down, and set it on the booster.
SST

09737–00010

(d)

Measure the clearance between the booster push rod
and pin head (SST).
Clearance: 0 mm (0 in.)

(e)

Adjust the booster push rod length until the push rod light-
ly touches the pin head.

NOTICE:
Adjust the clearance with no negative pressure applied in-
side the booster. (With the engine stopped, press the brake
pedal several times to set the pressure inside the booster
to the atmospheric pressure.)
4.

INSTALL MASTER CYLINDER (See page BR–22)

5.

CONNECT VACUUM HOSE TO BRAKE BOOSTER

6.

FILL BRAKE RESERVOIR WITH BRAKE FLUID AND
BLEED BRAKE SYSTEM (See page BR–4)

7.

CHECK FOR FLUID LEAKAGE

8.

CHECK AND ADJUST BRAKE PEDAL
(See page BR–6)

9.

DO OPERATIONAL CHECK (See page BR–23)

BR0IM–04

F13286

Pad Wear Indicator Plate

Anti–squeal Shim

Inner Pad

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

Disc brake grease

Europe:

Except Europe:

Pad Wear Indicator Plate

Inner Anti–squeal Shim

Anti–squeal Shim

Anti–squeal Shim

Inner Pad

Pad Support Plate

Inner Anti–squeal Shim

Anti–squeal Shim

34 (350, 25)

Pad Support Plate

34 (350, 25)

Outer Pad

Outer Pad

–

BRAKE

FRONT BRAKE PAD

BR–29

LEXUS RX300   (RM785E)

FRONT BRAKE PAD

COMPONENTS

BR0IN–04

F13271

F13272

BR–30

–

BRAKE

FRONT BRAKE PAD

LEXUS RX300   (RM785E)

REPLACEMENT

1.

REMOVE FRONT WHEEL

Remove the wheel and temporarily fasten the disc with the hub
nuts.

2.

INSPECT PAD LINING THICKNESS

Check the pad thickness through the caliper inspection hole
and replace the pads if they are not within specification.

Minimum thickness: 1.0 mm (0.039 in.)

3.

LIFT UP CALIPER

(a)

Hold the sliding pin on the bottom and loosen the installa-
tion bolt, and remove the installation bolt.

(b)

Lift up the caliper and suspend it securely.

HINT:
Do not disconnect the flexible hose from the caliper.
4.

REMOVE 2 PADS WITH ANTI–SQUEAL SHIMS AND
PAD WEAR INDICATOR PLATE

5.

REMOVE 2 PAD SUPPORT PLATES

NOTICE:
The support plates can be used again provided that they
have sufficient rebound, no deformation, cracks or wear,
and have had all rust, dirt and foreign particles cleaned off.
6.

CHECK DISC THICKNESS AND RUNOUT 
(See page BR–36)

7.

INSTALL 2 PAD SUPPORT PLATES

8.

INSTALL NEW PADS

NOTICE:
When replacing worn pads, the anti–squeal shims and pad
wear indicator plates must be replaced together with the
pads.

R00595

F00531

–

BRAKE

FRONT BRAKE PAD

BR–31

LEXUS RX300   (RM785E)

(a)

Install a pad wear indicator plate on the inner pad.

(b)

Apply disc brake grease to both sides of the inner anti–
squeal shims (See page BR–29).

(c)

Install the anti–squeal shims to each pad.

(d)

Install the inner pad with pad wear indicator plate facing
upward.

(e)

Install the outer pad.

NOTICE:
There should be no oil or grease adhering to the friction
surfaces of the pads or the disc.
9.

INSTALL CALIPER

(a)

Draw out a small amount of brake fluid from the reservoir.

(b)

Press in the piston with a hammer handle or an equiva-
lent.

HINT:
If the piston is difficult to push in, loosen the bleeder plug and
push in the piston while letting some brake fluid escape.
(c)

Install the caliper.

(d)

Install and torque the installation bolt.
Torque: 34 N·m (350 kgf·cm, 25 ft·lbf)

10.

INSTALL FRONT WHEEL
Torque: 103 N·m (1,050 kgf·cm, 76 ft·lbf)

11.

DEPRESS BRAKE PEDAL SEVERAL TIMES

12.

CHECK THAT FLUID LEVEL IS AT MAX LINE