Lexus SC300 / Lexus SC400. Manual — part 253

3.

REMOVE FOLLOWING PARTS:

(a) 2 anti–squeal springs
(b) 2 brake pads

CALIPER DISASSEMBLY

BR0EP–04

1. REMOVE CYLINDER BOOT SET RING AND CYLINDER

BOOT
Using a screwdriver, remove the cylinder boot set ring and
cylinder boot from the caliper.

2. REMOVE

PISTON

(a) Place

a

piece of cloth or similar article between the piston and

the caliper.

(b) Use compressed air to remove the piston from the caliper.

CAUTION: Do not place your fingers in front of the piston when

using compressed air.

3. REMOVE

PISTON

SEAL

Using a screwdriver, remove the piston seal from the caliper.

4.

REMOVE SLIDING PINS AND DUST BOOTS

(a) Remove the 2 sliding pins from the torque plate.

BR–40

–

BRAKE SYSTEM

REAR BRAKE (Disc Brake)

(b) Using a screwdriver and hammer, tap out the 2 dust boots.

REAR BRAKE COMPONENTS
INSPECTION AND REPAIR

BR04B–06

1.

MEASURE PAD LINING THICKNESS
Using a ruler, measure the pad lining thickness.

Standard thickness:

10.0 mm (0.394 in.)

Minimum thickness:

1.0 mm (0.039 in.)

Replace the pad if the pad’s thickness is at the minimum
thickness or less, or if the pad has severely uneven wear.

2.

MEASURE DISC THICKNESS
Using a micrometer, measure the disc thickness.

Standard thickness:

16.0 mm (0.630 in.)

Minimum thickness:

15.0 mm (0.591 in.)

Replace the disc if the thickness of the disc is at the minimum
thickness or less. Replace the disc or grind it on a lathe if it
is scored or is worn unevenly.

3.

MEASURE DISC RUNOUT
Measure the disc runout at 10 mm (0.39 in.) from the outer
edge of the disc.

Maximum disc runout:

0.05 mm (0.0020 in.)

If the disc’s runout is at the maximum value or greater, check
the bearing play in the axial direction and check the axle hub
runout (See page SA–52). If the bearing play and axle hub
runout are not abnormal, adjust the disc runout.

4.

IF NECESSARY, ADJUST DISC RUNOUT

(a) Remove the 2 bolt and torque plate from the carrier.
(b) Remove the hub nuts and the disc. Reinstall the disc 1/5 of

a turn round from its original position on the hub. Install and
torque the hub nuts.

Torque: 103 N

⋅

m (1,050 kgf

⋅

cm, 76 ft

⋅

lbf)

Remeasure the disc runout. Make a note of the runout and
the disc’s position on the hub.

–

BRAKE SYSTEM

REAR BRAKE (Disc Brake)

BR–41

(c) Repeat (b) until the disc has been installed on the 3

remaining hub positions.

(d) If

the minimum runout recorded in (b) and (c) is less than 0.05

mm (0.0020 in.), install the disc in that position.

(e) If the minimum runout recorded in (b) and (c) is greater than

0.05 mm (0.0020 in.), replace the disc and repeat step 3.

(f) Install the torque plate and tighten the 2 bolts.

Torque: 104 N

⋅

m (1,065 kgf

⋅

cm, 77 ft

⋅

lbf)

CALIPER ASSEMBLY

BR0EQ–04

1. APPLY

LITHIUM

SOAP

BASE

GLYCOL

GREASE

TO

PARTS INDICATED WITH ARROWS

2.

INSTALL DUST BOOTS AND SLIDING PINS

(a) Using a 19 mm socket and hammer, tap in 2 new dust boots

into the torque plate.

(b) Confirm that the metal plate portion of the dust boot fits

snugly in the torque plate.

(c) Insert 2 sliding pins into the torque plate.

NOTICE: Insert the sliding pin with the sliding bushing into the

bottom side.

BR–42

–

BRAKE SYSTEM

REAR BRAKE (Disc Brake)

3.

INSTALL PISTON SEAL AND PISTON IN CALIPER

4.

INSTALL CYLINDER BOOT AND CYLINDER BOOT SET
RING

CALIPER INSTALLATION

BR0ER–04

1. INSTALL

FOLLOWING

PARTS:

(a) 2 brake pads
(b) 2 anti–squeal springs

2. INSTALL

CALIPER

(a) Temporarily install the caliper on the torque plate with 2

installation bolts.

(b) Hold the sliding pin and torque the installation bolts.

Torque: 34 N

⋅

m (350 kgf

⋅

cm, 25 ft

⋅

lbf)

3.

CONNECT FLEXIBLE HOSE
Install the flexible hose on the caliper with 2 new gaskets.

Torque: 30 N

⋅

m (310 kgf

⋅

cm, 22 ft

⋅

lbf)

HINT: Install the flexible hose lock securely in the lock hole
in the caliper.

4. FILL

BRAKE

RESERVOIR WITH BRAKE FLUID AND

BLEED BRAKE SYSTEM
(See page

BR–8

)

5.

CHECK FOR LEAKS

–

BRAKE SYSTEM

REAR BRAKE (Disc Brake)

BR–43