2000 LEXUS GS400 brake pads

BR0JI±07
W00742
W00743
BR±16
± BRAKEFRONT BRAKE PAD
2124 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REPLACEMENT
1. REMOVE FRONT WHEEL
2. INSPECT PAD LINING THICKNESS
Check the pad thickness through the caliper inspection hole
and replace the pads if they are not within the 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.
(b) Remove the installation bolt.
(c) Lift up the caliper and suspend it securely.
HINT:
Do not disconnect the flexible hose from the caliper.
4. REMOVE 2 ANTI± SQUEAL SPRINGS
5. REMOVE 2 BRAKE PADS WITH 4 ANTI±SQUEAL
SHIMS
6. REMOVE 4 PAD SUPPORT PLATES
NOTICE:
The anti±squeal springs and support plates can be used
again provided that they have sufficient rebound, no de-
formation, cracks or wear, and have had all rust, dirt and
foreign particles cleaned off.
7. CHECK DISC THICKNESS AND RUNOUT
(See page BR±21)
8. INSTALL 4 PAD SUPPORT PLATES
9. INSTALL NEW PADS
NOTICE:
When replacing worn pads, the anti±squeal shims must be
replaced together with the pad.
(a) Install the 2 anti±squeal shims to each pad.
HINT:
Apply disc brake grease to both sides of the inner anti±squeal
shims (See page BR±15).
(b) Install the inner pad with the pad wear indicator plates fac-
ing downward.
(c) Install the outer pad.
NOTICE:
There should be no oil or grease adhering to the friction
surfaces of the pads or the disc.
(d) Install the 2 anti±squeal springs.

BR0JK±03
F01624
± BRAKEFRONT BRAKE CALIPER
BR±19
2127 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
1. DISCONNECT FLEXIBLE HOSE
Remove the union bolt and 2 gaskets from the caliper, then dis-
connect the flexible hose from the caliper. Use a container to
catch brake fluid as it drains out.
Torque: 30 N´m (310 kgf´cm, 22 ft´lbf)
HINT:
At the time of installation, install the flexible hose lock securely
in the lock hole in the caliper.
2. REMOVE CALIPER
(a) Hold the sliding pin and loosen the 2 installation bolts.
Torque: 34 N´m (350 kgf´cm, 25 ft´lbf)
(b) Remove the 2 installation bolts.
(c) Remove the caliper from the torque plate.
3. REMOVE 2 ANTI±SQUEAL SPRINGS
4. REMOVE 2 BRAKE PADS WITH 4 ANTI±SQUEAL
SHIMS
5. REMOVE 4 PAD SUPPORT PLATES

BR0JQ±03
F07245
F04917
A
A B
B
± BRAKEREAR BRAKE PAD
BR±25
2133 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REPLACEMENT
1. REMOVE REAR WHEEL
Remove the rear wheel and temporarily fasten the disc with the
3 hub nuts.
2. INSPECT PAD LINING THICKNESS
Check the pad thickness through the caliper inspection hole
and replace pads if the thickness is not within the specification.
Minimum thickness: 1.0 mm (0.039 in.)
3. REMOVE ANTI±SQUEAL SPRING AND PAD GUIDE
PIN
(a) Raise the ºBº portion with hand, push up the ºAº portion
and disengage the anti±squeal spring from brake caliper.
(b) Remove the anti±squeal spring.
NOTICE:

Do not deform the clip and anti±squeal spring.

The clip and anti±squeal spring can be used again
provided that they have sufficient rebound, no±de-
formation, cracks or wear, and have had all rust, dirt
and foreign particles cleaned off.
(c) Remove the clip and pad guide pin.
4. REMOVE PADS AND ANTI±SQUEAL SHIMS
(a) Remove the 2 pads.
(b) Remove the 4 anti±squeal shims from each pad.
5. CHECK DISC THICKNESS AND RUNOUT
(See page BR±30)
6. INSTALL NEW PADS
NOTICE:
When replacing worn pads, the anti±squeal shims must be
replaced together with the pads.
(a) Apply disc brake grease to both sides of inner anti±squeal
shims (See page BR±24).

F01635
Direction of disc rotation for
forward movement
F01636
F07232
AB
Claw
BR±26
± BRAKEREAR BRAKE PAD
2134 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(b) Install the 2 anti±squeal shims on each pad.
HINT:
Make sure the arrows on the inner anti±squeal shims facing to
the direction of disc rotation as shown in the illustration.
(c) Draw out a small amount of brake fluid from the reservoir.
(d) Press in the pistons with a monkey wrench handle or
equivalent.
HINT:

Tape the monkey wrench handle before use.

If the piston is difficult to push in, loosen the bleeder plug
and push in the piston while letting some brake fluid es-
cape.
(e) Install the 2 pads.
7. I N S TA L L PA D G U I D E P I N A N D A N T I ± S Q U E A L
SPRING
(a) Install the pad guide pin and clip.
(b) Install the anti±squeal spring.
HINT:

Ensure that the claw of the anti±squeal spring is raised up
on the caliper securely.

Ensure that there is no gap between the pad guide pin
and anti±squeal spring.

Ensure that ºAº and ºBº portions of anti±squeal spring are
attached to the pad.
8. INSTALL FRONT WHEEL
Torque: 103 N´m (1,050 kgf´cm, 76 ft´lbf)
9. DEPRESS BRAKE PEDAL SEVERAL TIMES
10. CHECK THAT FLUID LEVEL IS AT MAX LINE

BR0JS±06
F01639
BR±28
± BRAKEREAR BRAKE CALIPER
2136 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
1. REMOVE REAR WHEEL
Torque: 103 N´m (1,050 kgf´cm, 76 ft´lbf)
2. DISCONNECT FLEXIBLE HOSE
Remove the union bolt and gasket from the caliper, then discon-
nect the flexible hose from the caliper. Use a container to catch
brake fluid as it drains out.
Torque: 30 N´m (310 kgf´cm, 22 ft´lbf)
HINT:
At the time of installation, please refer to the following item.
Install the flexible hose lock securely in the lock hole in the cali-
per.
3. REMOVE CALIPER
(a) Remove the 2 installation bolts.
Torque: 104 N´m (1,065 kgf´cm, 77 ft´lbf)
(b) Remove the caliper.
4. REMOVE BRAKE PADS (See page BR±25)
(a) Remove the anti±squeal spring.
(b) Remove the clip and pad guide pin.
(c) Remove the 2 pads with the 4 anti±squeal shims.

BR0JU±07
F01643
F01644
F01645
BR±30
± BRAKEREAR BRAKE CALIPER
2138 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. MEASURE PAD LINING THICKNESS
Using a ruler, measure the pad lining thickness.
Standard thickness: 10.5 mm (0.413 in.)
Minimum thickness: 1.0 mm (0.039 in.)
Replace the pads if the thickness is less than the minimum or
if it shows signs of uneven wear.
2. MEASURE DISC THICKNESS
Using a micrometer, measure the disc thickness.
Standard thickness: 12.0 mm (0.472 in.)
Minimum thickness: 10.5 mm (0.413 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
badly scored or worn unevenly.
3. MEASURE DISC RUNOUT
Using a dial indicator, measure the disc runout at a position 10
mm (0.394 in.) away from the out side edge.
Maximum disc runout: 0.05 mm (0.0020 in.)
If the disc's runout is maximum value or greater, check the bear-
ing play in the axial direction and check the axle hub runout
(See page SA±44). If the bearing play and axle hub runout are
not abnormal, adjust the disc runout or grind it on a ºOn±Carº
brake lathe.
4. IF NECESSARY, ADJUST DISC RUNOUT
(a) Remove the 3 hub nuts and disc. Turn the disc 1/5 and
reinstall the disc. Install and torque the 3 hub nuts.
Torque: 103 N´m (1,050 kgf´cm, 76 ft´lbf)
(b) Remeasure the disc runout. Make a note of the runout
and the disc's position on the hub.
(c) Repeat (b) until the disc has been installed on the 3 re-
maining 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.

P09958
MA01R±01
MA±6
± MAINTENANCEBRAKE
49 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
BRAKE
INSPECTION
1. INSPECT BRAKE LINE PIPES AND HOSES
HINT:
Check in a well lighted area. Check the entire circumference
and length of the brake hoses using a mirror as required. Turn
the front wheels fully right or left before checking the front brake.
(a) Check all brake lines and hoses for.

Damage

Wear

Deformation

Cracks

Corrosion

Leaks

Bends

Twists
(b) Check all clamps for tightness and connections for leak-
age.
(c) Check that the hoses and lines are clear of sharp edges,
moving parts and the exhaust system.
(d) Check that the lines install in grommets pass through the
center of the grommets.
2. INSPECT FRONT AND REAR BRAKE PADS AND
DISCS
(FRONT PADS: See page BR±16)
(REAR PADS: See page BR±25)
(FRONT DISCS: See page BR±21)
(REAR DISCS: See page BR±30)
3. INSPECT PARKING BRAKE LININGS AND DRUMS
(See page BR±35)
4. INSPECT OR CHANGE BRAKE FLUID
(See page BR±4)
Fluid: SAE J1703 or FMVSS No.116 DOT3