Lexus GS300/400 (2000 year). Manual — part 104

BR0JZ–03

BR5332

F06409

BR5333

Shim

Clearance

–

BRAKE

PARKING BRAKE

BR–35

2143

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: 2.5 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 severe and uneven wear, replace the brake shoe.

3.

MEASURE BRAKE DISC INSIDE DIAMETER

Using a brake drum gauge or equivalent, measure the inside di-
ameter 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 value
or more.
Replace the disc or grind it with a lathe if the disc is scored or
worn unevenly.

4.

INSPECT PARKING BRAKE SHOE 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.

Thickness mm (in.)

Thickness mm (in.)

0.3 (0.012)

0.9 (0.035)

0.6 (0.024)

–

R15060

BR–36

–

BRAKE

PARKING BRAKE

2144

6.

IF NECESSARY, REPLACE SHIM

(a)

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

(b)

Install the correct size shim.

(c)

Install a new C–washer.

(d)

Remeasure the clearance.

BR0K0–03

F02913

Contract

–

BRAKE

PARKING BRAKE

BR–37

2145

REASSEMBLY

Reassembly is in the reverse order of disassembly (See
page

BR–34

).

HINT:
Apply high temperature grease to the parts indicated by the ar-
rows (See page

BR–33

).

1.

ADJUST PARKING BRAKE SHOE CLEARANCE

(a)

Temporarily install the 3 hub nuts.

(b)

Remove the hole plug.

(c)

Turn the adjuster and expand the shoes until the disc
locks.

(d)

Return the adjuster 8 notches.

(e)

Install the hole plug.

2.

SETTLING PARKING BRAKE SHOES AND DISC

(a)

Depress the parking brake pedal with a force of 147 N (15
kgf, 33 lbf).

(b)

Drive the vehicle at about 50 km/h (31 mph) on a safe, lev-
el and dry road.

(c)

Drive the vehicle for about 400 meters (0.25 mile) in this
condition.

(d)

Repeat this procedure 2 or 3 times.

3.

CHECK AND ADJUST PARKING BRAKE PEDAL
TRAVEL (See page

BR–11

)

F02911

SST

Effort Gauge

SST

BR0K7–04

BR–38

–

BRAKE

HYDRAULIC BRAKE BOOSTER

2146

HYDRAULIC BRAKE BOOSTER

ON–VEHICLE INSPECTION

1.

CHECK HYDRAULIC BRAKE BOOSTER FLUID PRES-
SURE CHANGE

(a)

Inspect the battery positive voltage.
Battery positive voltage: 10 – 14 V

(b)

Turn the ignition switch OFF, depress the brake pedal
more than 40 times.

(c)

Install LSPV gauge (SST) and brake pedal effort gauge,
bleed air.
SST

09709–29018

(d)

When booster does not operate.
Depress the brake pedal and check fluid pressure.
At 245 N (25 kgf, 55 lbf):

Front brake pressure

Rear brake pressure

1,470 kPa (15 kgf/cm

2

, 213 psi)

or more

0 kPa (0 kgf/cm

2

, 0 psi)

At 343 N (35 kgf, 77 lbf):

Front brake pressure

Rear brake pressure

2,059 kPa (21 kgf/cm

2

, 299 psi)

or more

0 kPa (0 kgf/cm

2

, 0 psi)

(e)

When booster operates.
(1)

Turn the ignition switch ON and wait until the pump
motor has stopped.

(2)

Depress the brake pedal and check fluid pressure.

At 49 N (5 kgf, 11 lbf):

Front brake pressure

Rear brake pressure

794 – 1,814 kPa

(8.1 – 18.5 kgf/cm

2

, 115 – 263 psi)

961 – 2,148 kPa

(9.8 – 21.9 kgf/cm

2

, 139 – 311 psi)

At 98 N (10 kgf, 22 lbf):

Front brake pressure

Rear brake pressure

3,442 – 5,011 kPa

(35.1 – 51.1 kgf/cm

2

, 499 – 727 psi)

3,923 – 5,698 kPa

(40 – 58.1 kgf/cm

2

, 569 – 826 psi)

At 147 N (15 kgf, 33 lbf):

Front brake pressure

Rear brake pressure

5,629 – 7,845 kPa

(57.4 – 80 kgf/cm

2

, 816 – 1,138 psi)

6,237 – 8,640 kPa

(63.6 – 88.1 kgf/cm

2

, 905 – 1,253 psi)

At 196 N (20 kgf, 44 lbf):

Front brake pressure

Rear brake pressure

8,002 – 10,591 kPa

(81.6 – 108 kgf/cm

2

, 1,161– 1,536 psi)

8,718 – 11,572 kPa

(88.9 – 118 kgf/cm

2

, 1,264 – 1,678 psi)