Lexus SC300 / Lexus SC400. Manual — part 254

REAR BRAKE
(Parking Brake)

COMPONENTS

BR04E–06

PARKING BRAKE DISASSEMBLY

BR04F–09

1.

REMOVE REAR WHEEL

2.

REMOVE REAR DISC BRAKE ASSEMBLY

(a) Remove the 2 mounting bolts and remove the disc brake

assembly.

(b) Suspend the disc brake so the hose is not stretched.

3. REMOVE

DISC

(a) Place matchmarks on the disc and rear axle hub.
(b) Remove the disc.

HINT: If the disc can not be removed easily, return the shoe
adjuster until the wheel turns freely.

BR–44

–

BRAKE SYSTEM

REAR BRAKE (Parking Brake)

4.

REMOVE SHOE RETURN SPRINGS
Using needle–nose pliers, remove the 2 shoe return springs.

5.

REMOVE SHOE STRUT WITH SPRING

6. REMOVE FRONT SHOE ADJUSTER AND TENSION

SPRING

(a) Slide out the front shoe and remove the shoe adjuster.
(b) Disconnect the tension spring and remove the front shoe.

7.

REMOVE REAR SHOE

(a) Slide out the rear shoe.
(b) Remove the tension spring from the rear shoe.

(c) Disconnect the parking brake cable from the parking brake

shoe lever.

(d) Remove the shoe hold–down spring cups, springs and pins.

–

BRAKE SYSTEM

REAR BRAKE (Parking Brake)

BR–45

PARKING BRAKE COMPONENTS
INSPECTION AND REPAIR

BR04G–0B

1.

INSPECT DISASSEMBLED PARTS
Inspect the disassembled parts for wear, rust or damage.

2.

MEASURE BRAKE SHOE LINING THICKNESS
Using a scale, measure the thickness of the shoe lining.

Standard thickness:

2.5 mm (0.098 in.)

Minimum thickness:

1.0 mm (0.039 in.)

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

3.

MEASURE BRAKE DISC INSIDE DIAMETER
Using a vernier caliper, measure the inside diameter of the
disc.

Standard inside diameter:

190 mm (7.48 in.)

Maximum inside diameter:

191 mm (7.52 in.)

Replace the disc if the inside diameter is at the maximum val-
ue 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.

BR–46

–

BRAKE SYSTEM

REAR BRAKE (Parking Brake)

ÑÑÑÑÑÑ

ÑÑÑÑÑÑ

Thickness

ÑÑÑÑÑÑ

ÑÑÑÑÑÑ

mm(in.)

ÑÑÑÑÑÑ

ÑÑÑÑÑÑ

Thickness

ÑÑÑÑÑ

ÑÑÑÑÑ

mm(in.)

ÑÑÑÑÑÑ

ÑÑÑÑÑÑ

0.3

ÑÑÑÑÑÑ

ÑÑÑÑÑÑ

(0.012)

ÑÑÑÑÑÑ

ÑÑÑÑÑÑ

0.9

ÑÑÑÑÑ

ÑÑÑÑÑ

(0.035)

ÑÑÑÑÑÑ

ÑÑÑÑÑÑ

ÑÑÑÑÑÑ

0.6

ÑÑÑÑÑÑ

ÑÑÑÑÑÑ

ÑÑÑÑÑÑ

(0.024)

ÑÑÑÑÑÑ

ÑÑÑÑÑÑ

ÑÑÑÑÑÑ

ÑÑÑÑÑ

ÑÑÑÑÑ

ÑÑÑÑÑ

6.

IF NECESSARY, REPLACE SHIM

(a) Remove the parking brake shoe lever, and install the correct

size shim.

(b) Install the parking brake shoe lever with a new Cwasher.
(c) Remeasure the clearance.

PARKING BRAKE ASSEMBLY

BR0ES–04

HINT: Assemble the parts in the correct direction, as shown.

1.

APPLY HIGH TEMPERATURE GREASE ON BACK– ING
PLATE

–

BRAKE SYSTEM

REAR BRAKE (Parking Brake)

BR–47