2000 LEXUS GS400 brake

I01278
I01279
Battery Ignition
SwitchWarning Light
I04095
OFF
ON
I04096
± BODY ELECTRICALCOMBINATION METER
BE±99
2400 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
17. INSPECT LOW OIL PRESSURE SWITCH CONTINUITY
(a) Disconnect the connector from the switch.
(b) Check that continuity exists between terminal and ground
with the engine stopped.
(c) Check that no continuity exists between terminal and
ground with the engine running.
HINT:
Oil pressure should be over 24.5 kPa (0.25 kgf/cm
2, 3.55 psi).
If operation is not as specified, replace the switch.
18. INSPECT BRAKE WARNING LIGHT
(a) Disconnect the connector from the brake fluid warning
switch.
(b) Release the parking brake pedal.
(c) Connect the terminals on the wire harness side of the lev-
el warning switch connector.
(d) Start the engine, check that the warning light lights up.
If the warning light does not light up, test the bulb or wire har-
ness.
19. INSPECT BRAKE FLUID LEVEL WARNING SWITCH
CONTINUITY
(a) Remove the reservoir tank cap and strainer.
(b) Disconnect the connector.
(c) Check that no continuity exists between the terminals with
the switch OFF (float up).
(d) Use siphon, etc. to take fluid out of the reservoir tank.
(e) Check that continuity exists between the terminals with
the switch ON (float down)
(f) Pour the fluid back in the reservoir tank.
If operation is not as specified, replace the switch.
20. INSPECT BRAKE FLUID LEVEL WARNING SWITCH
CIRCUIT (See page DI±835)
21. INSPECT PARKING BRAKE SWITCH CONTINUITY
(a) Check that continuity exists between the terminal and
switch body with the switch ON (switch pin released).
(b) Check that no continuity exists between the terminal and
switch body with the switch OFF (switch pin pushed in).
If operation is not as specified, replace the switch or inspect
ground point.
22. INSPECT PARKING BRAKE SWITCH CIRCUIT
(See page DI±796)

BR0J9±01
± BRAKEBRAKE SYSTEM
BR±1
2109 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
BRAKE SYSTEM
GENERAL DESCRIPTION

Care must be taken to replace each part properly as it could affect the performance of the brake
system and result in a driving hazard. Replace the parts with parts of the same part number or
equivalent.

It is very important to keep parts and the area clean when repairing the brake system.

If the vehicle is equipped with a mobile communication system, refer to the precautions in the
IN section.

F01619
BR0JD±03
F01620
Adjusting Nut
Lock Nut
± BRAKEPARKING BRAKE PEDAL
BR±11
2119 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
PARKING BRAKE PEDAL
ON±VEHICLE INSPECTION
1. CHECK PARKING BRAKE PEDAL TRAVEL
Depress the parking brake pedal all the way and count the num-
ber of clicks.
Parking brake lever travel at 294 N (30 kgf, 66.1 Ibf):
7 ± 9 clicks
2. IF NECESSARY, ADJUST PARKING BRAKE
HINT:
Before adjusting the parking brake, make sure that the rear
brake shoe clearance has been adjusted. For shoe clearance
adjustment see page BR±37.
(a) Loosen the lock nut and turn the adjusting nut until the
pedal travel is correct.
(b) Tighten the lock nut.
Torque: 5.4 N´m (55 kgf´cm, 48 in.´lbf)

BR0JE±03
F07241
No. 1 Safety Pad
No. 1 Under Cover
Front Door Scuff Plate End Pad
Parking Brake Switch
Parking Brake Pedal
AssemblyParking Brake WireAdjusting NutLock Nut
13 (130, 9)
5.4 (55, 48 in.´lbf)
No. 7 Heater to Register Duct
N´m (kgf´cm, ft´lbf) : Specified torque BR±12
± BRAKEPARKING BRAKE PEDAL
2120 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
COMPONENTS

BR0JF±03
± BRAKEPARKING BRAKE PEDAL
BR±13
2121 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
1. REMOVE FRONT DOOR SCUFF PLATE, END PAD, NO. 1 UNDER COVER, NO. 1 SAFETY PAD
AND NO. 7 HEATER TO REGISTER DUCT (See page BO±88)
2. REMOVE PARKING BRAKE PEDAL ASSEMBLY
(a) Disconnect the parking brake switch connector.
(b) Remove the 2 bolts, and disconnect the parking brake release lever from the safety pad.
Torque: 5.4 N´m (55 kgf´cm, 48 in.´lbf)
(c) Remove the lock nut and the adjusting nut from the parking brake wire.
(d) Remove the parking brake wire.
(e) Remove the 2 bolts, 2 nuts and parking brake pedal assembly.
Torque: 13 N´m (130 kgf´cm, 9 ft´lbf)
3. REMOVE PARKING BRAKE SWITCH
Remove the screw and parking brake switch from the parking brake pedal assembly.

BR0JG±02
BR±14
± BRAKEPARKING BRAKE PEDAL
2122 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSTALLATION
Installation is in the reverse order of removal (See page BR±13).
HINT:
After the installation, check and adjust parking brake pedal travel (See page BR±11).

BR0JH±05
F01622
Anti±squeal ShimPad Support Plate
Anti±squeal Spring
Inner Pad
Outer Pad
Anti±squeal Shim
Inner Anti±squeal Shim
Pad Support Plate
Inner Anti±squeal Shim34 (350, 25)
N´m (kgf´cm, ft´lbf) : Specified torque
Disc brake grease
± BRAKEFRONT BRAKE PAD
BR±15
2123 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
FRONT BRAKE PAD
COMPONENTS

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.