2000 LEXUS GS400 brake fluid

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.

BR0JW±04
BR±32
± BRAKEREAR BRAKE CALIPER
2140 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSTALLATION
Installation is in the reverse order of removal (See page BR±28).
HINT:

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

Check for leaks.

F02911
SST
Effort Gauge
SST
BR0K7±04
BR±38
± BRAKEHYDRAULIC BRAKE BOOSTER
2146 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
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 pressureRear brake pressure
1,470 kPa (15 kgf/cm2, 213 psi)
or more0 kPa (0 kgf/cm2, 0 psi)
At 343 N (35 kgf, 77 lbf):
Front brake pressureRear brake pressure
2,059 kPa (21 kgf/cm2, 299 psi)
or more0 kPa (0 kgf/cm2, 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 pressureRear brake pressure
794 ± 1,814 kPa
(8.1 ± 18.5 kgf/cm2, 115 ± 263 psi)
961 ± 2,148 kPa
(9.8 ± 21.9 kgf/cm2, 139 ± 311 psi)
At 98 N (10 kgf, 22 lbf):
Front brake pressureRear brake pressure
3,442 ± 5,011 kPa
(35.1 ± 51.1 kgf/cm2, 499 ± 727 psi)
3,923 ± 5,698 kPa
(40 ± 58.1 kgf/cm2, 569 ± 826 psi)
At 147 N (15 kgf, 33 lbf):
Front brake pressureRear brake pressure
5,629 ± 7,845 kPa
(57.4 ± 80 kgf/cm2, 816 ± 1,138 psi)
6,237 ± 8,640 kPa
(63.6 ± 88.1 kgf/cm2, 905 ± 1,253 psi)
At 196 N (20 kgf, 44 lbf):
Front brake pressureRear brake pressure
8,002 ± 10,591 kPa
(81.6 ± 108 kgf/cm2, 1,161± 1,536 psi)
8,718 ± 11,572 kPa
(88.9 ± 118 kgf/cm2, 1,264 ± 1,678 psi)

F02830
F02831
BR±46
± BRAKEHYDRAULIC BRAKE BOOSTER
2154 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(p) Inspect the rear TRAC & VSC solenoid.
(1) Release the parking brake pedal and shift the shift
lever to ºLº position.
(2) Push and hold the ºSA3º switch and ºSTRº switch
simultaneously.
NOTICE:

Do not keep the ºSTRº switch pushed down for more
than 10 seconds.

Do not keep the ºSA3º switch pushed down for more
than 5 seconds.

When operating it continuously, set the interval of
more than 20 seconds.
(3) Check that the rear wheels stop.
If the rear wheels rotate, replace the hydraulic brake booster.
(4) Release the ºSA3º switch and ºSTRº switch simulta-
neously.
(5) Check that the rear wheels rotate.
If the rear wheels stop, replace the hydraulic brake booster.
(q) Inspect the right rear ABS solenoid.
(1) Turn the selector switch to ºRHº position.
(2) Depress the brake pedal several times and release
the brake pedal when the pump begins rotating.
Wait until the pump stops.
(3) Turn the ignition switch OFF.
(4) Depress the brake pedal with a force of 343 N (35
kgf, 77 lbf), record the fluid surface in the reservoir
tank of the hydraulic brake booster.
(5) Press the MAIN push switch for 10 sec., and check
that the fluid surface in the reservoir tank of the hy-
draulic brake booster does not rise up at this time.
If the fluid surface level rises up, replace the hydraulic brake
booster.
NOTICE:
Do not press MAIN push switch for more than 10 sec. When
operating the switch continuously, do it an interval of more
than 20 seconds.
(6) Start the engine and run it at idle.
(7) Depress the brake pedal.
(8) Release the parking brake pedal and shift the shift
lever to ºLº position.
(9) Once, release the brake pedal. After depressing the
brake pedal with stable force, then push and hold
MAIN push switch.
(10) Check that the right rear wheel rotates.
If the right rear wheel stops, replace the hydraulic brake boost-
er.

F02832
± BRAKEHYDRAULIC BRAKE BOOSTER
BR±47
2155 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(r) Inspect the left rear ABS solenoid.
(1) Turn the selector switch to ºLHº position.
(2) Depress the brake pedal several times and release
the brake pedal when the pump begins rotating.
Wait until the pump stops.
(3) Turn the ignition switch OFF.
(4) Depress the brake pedal with a force of 343 N (35
kgf, 77 lbf), record the fluid surface in the reservoir
tank of the hydraulic brake booster.
(5) Press the MAIN push switch for 10 sec., and check
that the fluid surface in the reservoir tank of the hy-
draulic brake booster does not rise up at this time.
If the fluid surface level rises up, replace the hydraulic brake
booster.
NOTICE:
Do not press MAIN push switch for more than 10 sec. When
operating the switch continuously, do it an interval of more
than 20 seconds.
(6) Start the engine and run it at idle.
(7) Depress the brake pedal.
(8) Release the parking brake pedal and shift the shift
lever to ºLº position.
(9) Once, release the brake pedal. After depressing the
brake pedal with stable force, then push and hold
MAIN push switch.
(10) Check that the left rear wheel rotates.
If the left rear wheel stops, replace the hydraulic brake booster.
(s) Stop the engine and lower the vehicle.
(t) Remove the ºSHEET Gº (SST) and disconnect the actua-
tor checker (SST) and sub±wire harness S (SST) from the
hydraulic brake booster.
(u) Connect the 2 connectors to the actuator.
(v) Clear the DTC (See page DI±389).

BR0JC±04
D01827
LEXUS
Hand±held
Tester
DLC3
BR±4
± BRAKEBRAKE FLUID
2112 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
BRAKE FLUID
BLEEDING
HINT:

If any work is done on the brake system or if air in the
brake lines is suspected, bleed the air from the system.

When bleeding, keep the amount of the fluid within the
line of reservoir between Min. and Max.
NOTICE:

Do not let brake fluid remain on painted surfaces.
Wash it off immediately.

With the reservoir cap removed, when depressing the
brake pedal, the fluid will spray.
1. FILL RESERVOIR WITH BRAKE FLUID
Fluid: SAE J1703 or FMVSS NO. 116 DOT3
2. IN CASE OF USING LEXUS HAND±HELD TESTER:
BLEED HYDRAULIC BRAKE BOOSTER
HINT:
If the hydraulic brake booster has been disassembled, discon-
nect the brake line from the hydraulic brake booster or if the res-
ervoir becomes empty, bleed the hydraulic brake booster.
(a) Turn the ignition switch OFF, depress the brake pedal
more than 40 times.
HINT:
When a pressure in power supply system is released, reaction
force becomes heavy and stroke becomes shorter.
(b) Turn the ignition switch ON, check that the pump stops af-
ter approx. 30 to 40 seconds.
NOTICE:
When the pump does not stop, repeat step (a) and (b) again.
(c) With the ignition switch remained ON, depress the brake
pedal more than 20 times.
(d) Observe the procedure in step 4 and bleed the right and
left front brake caliper.
(e) Holding the brake pedal depressed, bleed the right and
left rear brake caliper.
HINT:
It is not necessary to depress the pedal continuously, as brake
fluid flows out by first depressing.
(f) Connect LEXUS hand±held tester.
(1) Turn the ignition switch OFF, connect the LEXUS
hand±held tester to DLC3.
(2) Turn the ignition switch ON, and select ºAIR
BLEEDINGº on the LEXUS hand±held tester.
HINT:
Please refer to the LEXUS hand±held tester operator's manual
for further details.

F06049
± BRAKEBRAKE FLUID
BR±5
2113 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(g) Bleed right front brake line.
(1) Select ºFR LINEº on the LEXUS hand±held tester.
(2) With ºFR LINEº turned ON with the LEXUS hand±
held tester, depress the brake pedal and hold it to
bleed the right front brake caliper.
(3) Repeat step (2) until there are no more air bubbles
in the fluid.
(h) Bleed left front brake line.
(1) Select ºFL LINEº on the LEXUS hand±held tester.
(2) With ºFL LINEº turned ON with the LEXUS hand±
held tester, depress the brake pedal and hold it to
bleed the left front brake caliper.
(3) Repeat step (2) until there are no more air bubbles
in the fluid.
(i) Bleed rear brake line.
(1) Select ºRR LINEº on the LEXUS hand±held tester.
(2) With ºRR LINEº turned ON with the LEXUS hand±
held tester, bleed the left and right rear brake cali-
per.
(j) Disconnect the LEXUS hand±held tester from DLC3.
(k) Clear the DTC (See page DI±389).
3. IN CASE OF USING ABS ACTUATOR CHECKER
(SST):
BLEED HYDRAULIC BRAKE BOOSTER
HINT:
If the hydraulic brake booster has been disassembled, discon-
nect the brake line from the hydraulic brake booster or if the res-
ervoir becomes empty, bleed the hydraulic brake booster.
(a) Disconnect the 2 connectors from the hydraulic brake
booster.