Lexus RX300 (MCU15). Service manual - part 174

BR06Y–05

BR–48

–

BRAKE

REAR BRAKE CALIPER

LEXUS RX300   (RM785E)

INSTALLATION

Installation is in the reverse order of removal (See page BR–44).
HINT:

S

After installation, fill the brake reservoir with brake fluid and bleed brake system (See page BR–4).

S

Check for leaks.

BR06Z–06

F04967

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

High temperature grease

z Non–reusable part

Guide Plate

Spring

Shoe Strut

Shim

z C–washer

Pin

Front Shoe

Adjuster

Tension Spring

Shoe Hold–down
Spring

Shoe Hold–down
Spring Cap

Plug

Rear Shoe Pin

Shoe Return 
Spring

47 (475, 34)

Rear Disc 
Brake

Adjuster

Parking Brake
Lever

–

BRAKE

PARKING BRAKE

BR–49

LEXUS RX300   (RM785E)

PARKING BRAKE

COMPONENTS

BR070–04

F13365

R00309

F04953

F04954

BR–50

–

BRAKE

PARKING BRAKE

LEXUS RX300   (RM785E)

DISASSEMBLY

1.

REMOVE REAR WHEEL

2.

REMOVE REAR DISC BRAKE ASSEMBLY

(a)

Remove the 2 mounting bolts and remove the disc brake
assembly.
Torque: 47 N·m (475 kgf·cm, 34 ft·lbf)

(b)

Suspend the disc brake securely. Ensure that the hose is
not stretched.

3.

REMOVE DISC

HINT:
If the disc cannot be removed easily, turn the shoe adjuster until
the wheel turns freely.

4.

REMOVE SHOE RETURN SPRINGS

Using needle–nose pliers, remove the 2 shoe return springs.
5.

REMOVE FRONT SHOE

(a)

Slide out the front shoe and remove the adjuster.

(b)

Remove the shoe strut with the spring.

(c)

Remove the shoe hold–down spring caps, spring and pin.

(d)

Disconnect the tension spring and remove the front shoe.

6.

REMOVE REAR SHOE

(a)

Slide out the rear shoe.

(b)

Remove the tension spring from the rear shoe.

(c)

Remove the shoe hold–down spring caps, spring and pin.

(d)

Using needle–nose pliers, disconnect the parking brake
cable from the parking brake shoe lever.

BR071–05

BR5332

F06409

BR0828

R00343

Shim

Clearance

R00313

–

BRAKE

PARKING BRAKE

BR–51

LEXUS RX300   (RM785E)

INSPECTION

1.

INSPECT DISASSEMBLED PARTS

Inspect the disassembled parts for wear, rust or damage.
2.

MEASURE BRAKE SHOE LINING THICKNESS

Using a ruler, measure the thickness of the shoe lining.

Standard thickness: 2.0 mm (0.079 in.)
Minimum thickness: 1.0 mm (0.039 in.)

If the lining thickness is at the minimum thickness or less, or if
there is severe, uneven wear, replace the brake shoe.

3.

MEASURE DISC INSIDE DIAMETER

Using brake drum gauge or equivalent, measure the inside di-
ameter of the disc.

Standard inside diameter: 170 mm (6.69 in.)
Maximum inside diameter: 171 mm (6.73 in.)

Replace the disc if the inside diameter is at the maximum value
or more. Replace the disc or grind it with a lathe if the disc is
scored or is worn unevenly.

4.

INSPECT PARKING BRAKE LINING AND DISC FOR
PROPER CONTACT

Apply chalk to the inside surface of the disc, then grind down
the brake shoe lining to fit. If the contact between the disc and
the brake shoe lining is improper, repair it using a brake shoe
grinder or replace the brake shoe assembly.

5.

MEASURE CLEARANCE BETWEEN PARKING
BRAKE SHOE AND LEVER

Using a feeler gauge, measure the clearance.

Standard clearance: Less than 0.35 mm (0.0138 in.)

If the clearance is not within the specification, replace the shim
with one of the correct size.

Shim Thickness

Shim Thickness

0.3 mm (0.012 in.)

0.9 mm (0.035 in.)

0.6 mm (0.024 in.)

–

6.

IF NECESSARY, REPLACE SHIM

(a)

Using a screwdriver, remove the C–washer and shim.

(b)

Install the correct size shim.

(c)

Using needle–nose pliers, install the parking brake lever
with a new C–washer.

(d)

Remeasure the clearance.