brake fluid LEXUS SC300 1991 Service Owner's Manual
[x] Cancel search | Manufacturer: LEXUS, Model Year: 1991, Model line: SC300, Model: LEXUS SC300 1991Pages: 4087, PDF Size: 75.75 MB
Page 989 of 4087
MASTER CYLINDER
MASTER CYLINDER REMOVAL
BR0EF±03
1. w/ TRAC:DRAIN OUT HIGH PRESSURE FLUID
(a) C onnect a vinyl tube to the bleeder plug of the TRAC
actuator, then loosen the bleeder plug with the ignition switch
in the OFF position.
CAUTION: The fluid is under high pressure, and could spray
out with great force, so exercise caution.
(b) Tighten the plug when fluid stops flowing out.
2. DISCONNECT LEVEL WARNING SWITCH CONNECTOR
3. DRAW OUT FLUID WITH SYRINGE
NOTICE: Do not let brake fluid remain on a painted surface.
Wash it off immediately.
4. DISCONNECT BRAKE LINES Using SST, disconnect the brake lines from the master cylin-
der.
SST 09023±00100
BR±12
±
BRAKE SYSTEM MASTER CYLINDER
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Page 994 of 4087
8. INSTALL MASTER CYLINDER BOOTWith the UP mark on the master cylinder boot facing up-
wards, install the cylinder boot on the master cylinder.
MASTER CYLINDER INSTALLATION
BR0EJ±05
1. ADJUST LENGTH OF BRAKE BOOSTER PUSH RODBEFORE INSTALLING MASTER CYLINDER
(See page
BR±19)
2. INSTALL MASTER CYLINDER Install the master cylinder and a new gasket on the brake
booster with 3 nuts.
Torque: 13 N Vm (130 kgf Vcm, 9 ft Vlbf)
3. CONNECT BRAKE LINES
Using SST, connect the brake lines to the master cylinder.
Torque the union nuts.
SST 09023±00100
Torque: 12 N Vm (125 kgf Vcm, 9 ft Vlbf)
4. CONNECT LEVEL WARNING SWITCH CONNECTOR
5. FILL BRAKE R ESERVOIR WITH BRAKE FLUID AND
BLEED BRAKE SYSTEM
(See page BR±8)
6. w/ TRAC:
BLEED TRAC SYSTEM
(See page BR±10)
7. CHECK FOR FLUID LEAKAGE
8. CHECK AND ADJUST BRAKE PEDAL (See page BR±7 )
±
BRAKE SYSTEM MASTER CYLINDERBR±17
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Page 995 of 4087
BRAKE BOOSTER
BRAKE BOOSTER REMOVAL
BR0EK±03
1. w/ TRAC:DRAIN OUT HIGH PRESSURE FLUID
(a) C onnect a vinyl tube to the bleeder plug of the TRAC
actuator, then loosen the bleeder plug with the ignition switch
in the OFF position.
CAUTION: The fluid is under high pressure, and could
spray out with great force, so exercise caution.
(b) Tighten the plug when fluid stops flowing out.
2. REMOVE FOLLOWING PARTS: wMaster cylinder
(See page BR±12)
w w/ TRAC:
TRAC pump assembly
(See page BR±162)
w Vacuum hose
w Clip and return spring
BR±18
±
BRAKE SYSTEM BRAKE BOOSTER
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Page 997 of 4087
4. FILL BRAKE RESERVOIR WITH BRAKE FLUID AND
BLEED BRAKE SYSTEM
(See page BR±8)
5. w/ TRAC:
BLEED TRAC SYSTEM
(See page BR±10)
6. CHECK FOR FLUID LEAKAGE
7. CHECK AND ADJUST BRAKE PEDAL (See page BR±7)
8. PERFORM OPERATIONAL CHECK (See page BR±8)
BR±20
±
BRAKE SYSTEM BRAKE BOOSTER
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Page 1000 of 4087
(c) Install the new pad support plates.
8. INSTALL NEW PADS
(a) Apply disc brake grease to both sides of the inner anti±squeal
shim.
(b) Install the 2 anti±squeal shims on each pad.
(c) Install inner pad with the pad wear indicator plates facing downward.
(d) Install the outer pad.
NOTICE: There should be no oil or grease adhering to the fric-
tion surfaces of the pads or the disc.
(e) Install the 2 anti±squeal springs.
9. INSTALL CALIPER
(a) Draw out a small amount of brake fluid from the reservoir.
(b) P re ss in th e pisto n with wa te r pu mp plie rs or simila r
implement.
HINT: If the piston is difficult to push in, loosen the bleeder
plug and push in the piston while letting some brake fluid es-
cape.
(c) Install the caliper.
(d) Hold the sliding pin and torque the installation bolt.
Torque: 34 N Vm (350 kgf Vcm, 25 ft Vlbf)
10. INSTALL FRONT WHEEL
11. CHECK THAT FLUID LEVEL IS AT MAX LINE
CALIPER REMOVAL
BR042±0C
1. DISCONNECT FLEXIBLE HOSE
(a) Remove the union bolt and 2 gaskets from the caliper, then
disconnect the flexible hose from the caliper.
(b) Use a container to catch the brake fluid as it drains out.
±
BRAKE SYSTEM FRONT BRAKE (SC400)BR±31
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Page 1005 of 4087
2. INSTALL CALIPER
(a) Temporarily install the caliper on the torque plate with 2installation bolts.
(b) Hold the sliding pin and torque the installation bolt.
Torque: 34 N Vm (350 kgf Vcm, 25 ft Vlbf)
3. CONNECT FLEXIBLE HOSE
Install the flexible hose on the caliper with 2 new gaskets.
Torque: 30 N Vm (310 kgf Vcm, 22 ft Vlbf)
HINT: Insert the flexible hose lock securely in the lock hole in
the caliper.
4. FILL BRAKE R ESERVOIR WITH BRAKE FLUID AND
BLEED BRAKE SYSTEM
(See page BR±8)
5. CHECK FOR LEAKS
BR±36
±
BRAKE SYSTEM FRONT BRAKE (SC400)
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Page 1008 of 4087
8. INSTALL NEW PADS
(a) Apply disc brake grease to both sides of the inner anti±squeal
shim.
(b) Install the 2 anti±squeal shims on each pad.
(c) Install the inner pad with the pad wear indicator plates facing
downward.
(d) Install the outer pad.
NOTICE: There should be no oil or grease adhering to the fric-
tion surfaces of the pads or the disc.
(e) Install the 2 anti±squeal springs.
9. INSTALL CALIPER
(a) Draw out a small amount of brake fluid from the reservoir.
(b) P re ss in th e pisto n with wa te r pu mp plie rs or simila r implement.
HINT: If the piston is difficult to push in, loosen the bleeder
plug and push in the piston while letting some brake fluid es-
cape.
(c) Install the caliper.
(d) Hold the sliding pin and torque the installation bolt.
Torque: 34 N Vm (350 kgf Vcm, 25 ft Vlbf)
10. INSTALL REAR WHEEL
11. CHECK THAT FLUID LEVEL IS AT MAX LINE
CALIPER REMOVAL
BR0EN±04
1. DISCONNECT FLEXIBLE HOSE
(a) Remove the union bolt and 2 gaskets from the caliper, then
disconnect the flexible hose from the caliper.
(b) Use a container to catch the brake fluid as it drains out.
2. REMOVE CALIPER
(a) Hold the sliding pin and loosen the 2 installation bolts.
(b) Remove the 2 installation bolts.
(c) Remove the caliper from the torque plate.
±
BRAKE SYSTEM REAR BRAKE (Disc Brake)BR±39
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Page 1012 of 4087
3. INSTALL PISTON SEAL AND PISTON IN CALIPER
4. INSTALL CYLINDER BOOT AND CYLINDER BOOT SETRING
CALIPER INSTALLATION
BR0ER±04
1. INSTALL FOLLOWING PARTS:
(a) 2 brake pads
(b) 2 anti±squeal springs
2. INSTALL CALIPER
(a) Temporarily install the caliper on the torque plate with 2installation bolts.
(b) Hold the sliding pin and torque the installation bolts.
Torque: 34 N Vm (350 kgf Vcm, 25 ft Vlbf)
3. CONNECT FLEXIBLE HOSE
Install the flexible hose on the caliper with 2 new gaskets.
Torque: 30 N Vm (310 kgf Vcm, 22 ft Vlbf)
HINT: Install the flexible hose lock securely in the lock hole
in the caliper.
4. FILL BRAKE R ESERVOIR WITH BRAKE FLUID AND
BLEED BRAKE SYSTEM
(See page BR±8)
5. CHECK FOR LEAKS
±
BRAKE SYSTEM REAR BRAKE (Disc Brake)BR±43
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Page 1020 of 4087
PROPORTIONING AND BY±PASS
VALVE (P & B VALVE)
FLUID PRESSURE INSPECTION
BR0ET±01
1. INSTALL LSPV GAUGE (SST) AND BLEED AIRSST 09709±29017
2. RAISE MASTER CYLINDER PRESSURE AND CHECKREAR WHEEL CYLINDER PRESSURE
Master cylinder pressure Rear wheel cylinder pressure
1,961 kPa 1,961 kPa
(20 kgf/cm2, 284 psi)
(20 kgf/cm2, 284 psi)
7,845 kPa5,492 kPa
(80 kgf/cm2, 1,138 psi) (56 kgf/cm2, 796 psi)
Specifications: If the rear wheel cylinder pressure is in-
correct, replace the master cylinder.
3. BLEED BRAKE SYSTEM
4. CHECK FOR FLUID LEAKAGE
±
BRAKE SYSTEM PROPORTIONING AND BY±PASS VALVE (P & B
VALVE)BR±51
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Page 1029 of 4087
![LEXUS SC300 1991 Service Owners Manual
w/TRAC:
Symbols
(Terminals No.)
STD Voltage (V)\
\
\
Condition](/img/36/57052/w960_57052-1028.png "LEXUS SC300 1991 Service Owners Manual
w/TRAC:
Symbols
(Terminals No.)
STD Voltage (V)\
\
\
Condition")
w/TRAC:
Symbols
(Terminals No.)
STD Voltage (V)\
\
\
Condition
BAT
(A25±21)
±
GND
(A25±22)
10±14\
\
\
Always
IG
(A24±24)
±
GND
(A25±22)
10±14\
\
\
IG switch ON
SR
(A24±22) ± R±
(A24±25) 8.3±14\
\
IG switch ON, ABS warning light OFF
MR
(A25±16)
±
R±
(A24±25)
Below 1.0
\
\
\
IG switch ON
TSR
(A24±1)
±
R±
(A24±25)
8.3±14
\
\
\
IG switch ON, TRAC indicator light OFF
TMR
(A24±9)
±
R±
(A24±25)
Below1.0
\
\
\
IG switch ON
SFR
(A25±1)
±
GND
(A25±2)
10±14\
\
\
IG switch ON, ABS warning light OFF
SFL
(A24±13)
±
GND
(A25±22)
10±14\
\
\
IG switch ON, ABS warning light OFF
SRR
(A24±26) ±
GND
(A25±22)
10±14\
\
IG switch ON, ABS warning light OFF
SRL
(A25±12)
±
GND
(A25±13)
10±14
\
\
\
IG switch ON, ABS warning light OFF
AST
(A24±8)
±
GND
(A25±22)
10±14
\
\
\
IG switch ON, ABS warning light OFF
SAC
(A24±12)
±
GND
(A25±22)
10±14
\
\
\
IG switch ON, TRAC indicator light OFF
SMC
(A24±2)
±
GND
(A25±22)
10±14\
\
\
IG switch ON, TRAC indicator light OFF
SRC
(A24±15)
±
GND
(A25±22)
10±14\
\
\
IG switch ON, TRAC indicator light OFF
PR
(A24±10)
±
E2
(A24±20)
5±7\
\
\
IG switch ON
VC
(A24±19) ± E2
(A24±20) 4±6\
\
IG switch ON
ALT
±
GND
Below 1.0\
\
\
IG switch ON
ALT
(A25±8)
±
GND
(A25±22) 10±14\
\
Idling
WA ± GND Below 2.0\
\
IG switch ON, ABS warning light ON
WA
(A25±9) ±
GND
(A25±22) 10±14\
\
IG switch ON, ABS warning light OFF
PKB
±
GND
Below 1.5\
\
\
IG switch ON, PKB switch ON,
Fluid in M/C reservoir above MIN level
PKB
(A25±17)
±
GND
(A25±22)
10±14\
\
\
IG switch ON, PKB switch OFF,
Fluid in M/C reservoir above MIN level
BR±60±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)
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