1991 LEXUS SC400 Service Repair Manual

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Page 969 of 4087

LEXUS SC400 1991 Service Repair Manual
WIRING DIAGRAM
±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)BR±223
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Page 970 of 4087

LEXUS SC400 1991 Service Repair Manual
NOYES
OKNG
OKNG
OKNG
OKNG
INSPECTION PROCEDURES
1Is diagnostic trouble code output?
Perform diagnostic trouble code check on page BR±184.
Repair circuit indicated by the code output.
2Check TRAC cut

Page 971 of 4087

LEXUS SC400 1991 Service Repair Manual
BR±150). BE±163
.
IN±33
).
WIRING DIAGRAM
TRAC Indicator Light Circuit
CIRCUIT DESCRIPTION
The TRAC indicator blinks during TRAC operation.
This indicator is also used for warnings when the tro

Page 972 of 4087

LEXUS SC400 1991 Service Repair Manual
BR±160).
IN±33 ).
WIRING DIAGRAM
Tc Terminal Circuit
CIRCUIT DESCRIPTION
By connecting between terminals Tc and E1 of DLC1 or DLC2, the ECU displays the diagnostic trouble
code by blinking the TRAC

Page 973 of 4087

LEXUS SC400 1991 Service Repair Manual
NGOK
OKNG
INSPECTION PROCEDURE
1Check voltage between terminals Tc and E1 of DLC 2 or DLC 1.
C
OK
PTurn ignition switch ON.
Measure voltage between terminals TC and E1 of DLC
2 or DLC 1.
Voltage: 10

Page 974 of 4087

LEXUS SC400 1991 Service Repair Manual
Check for Fluid Leakage
BR±228±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)
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Page 975 of 4087

$LEXUS SC400 1991 Service Repair Manual SERVICE SPECIFICATIONS SERVICE DATA BR03A±0G\ \ Brake pedal height from asphalt sheet (LHD) 150.4±160.4 mm (5.92±6.31 in$

SERVICE SPECIFICATIONS
SERVICE DATA
BR03A±0G\
\
Brake pedal height from asphalt sheet (LHD) 150.4±160.4 mm (5.92±6.31 in.)
\

\
Brake pedal freeplay

1±6 mm (0.04±0.24 in.)
\

\
Brake pedal reserve distance at 490 N (50 kgf, 110.2
lbf)

More than 89 mm (3.50 in.)
\
\
Brake booster push rod to piston clearance (w/ SST) 0 mm (0 in.)
\
\
Front brake pad thickness STD 11.0 mm (0.433 in.)
\
\
Front brake pad thickness Limit 1.0 mm (0.039 in.)\

\
Front brake disc thickness (SC 300)

STD

28.0 mm (1.102 in.)
\
\
Front brake disc thickness (SC 300) Limit 26.0 mm (1.024 in.)
\
\
Front brake disc thickness (SC 400) STD 32.0 mm (1.260 in.)
\

\
Front brake disc thickness (SC 400)

Limit

30.0 mm (1.181 in.)
\
\
Front brake disc runout Limit 0.05 mm (0.0020 in.)
\
\
Rear brake disc pad thickness STD 10.0 mm (0.394 in.)
\
\
Rear brake disc pad thickness Limit 1.0 mm (0.039 in.)\

\
Rear brake disc thickness

STD

16.0 mm (0.630 in.)
\
\
Rear brake disc thickness Limit 15.0 mm (0.591 in.)
\
\
Rear brake disc runout Limit 0.05 mm (0.0020 in.)
\

\
Rear brake disc inside diameter

STD

190 mm (7.48 in.)
\
\
Rear brake disc inside diameter Limit 191 mm (7.52 in.)
\
\
Parking brake lining thickness STD 2.5 mm (0.098 in.)
\
\
Parking brake lining thickness Limit 1.0 mm (0.039 in.)\

\
Parking brake lever travel at 196 N (20 kgf, 44.1 lbf)

5±8 clicks
\
\
Parking brake clearance between rear shoe and lever Less than 0.35 mm (0.012 in.)
\

\
Parking brake adjusting shim thickness for rear disc
brake

0.3 mm (0.012 in.)
\
\
0.6 mm (0.024 in.)
\

\

0.9 mm (0.035 in.)
±
BRAKE SYSTEM SERVICE SPECIFICATIONSBR±229
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Page 976 of 4087

$LEXUS SC400 1991 Service Repair Manual TORQUE SPECIFICATIONS BR03B±0G\ \ \ Part tightened N Vm kgf Vcm ft Vl$

TORQUE SPECIFICATIONS
BR03B±0G\

\

\
Part tightened

N
Vm

kgf
Vcm

ft
Vlbf
\
\
Master cylinder x Piston stopper bolts 10 100 7
\
\
Master cylinder x Reservoir 1.7 17.5 15.2 in. Vlbf
\

\

\
Master cylinder x Brake booster

13

130

9
\
\
Brake tube union nut 15 155 11
\
\
Brake booster clevis lock nut 25 260 19
\
\
Brake booster x Pedal bracket 15 150 11\

\

\
Bleeder plug (TRAC actuator and TRAC accumulator)

8.3

85

74 in.
Vlbf
\
\
Bleeder plug 11 11 0 8
\
\
Front disc brake torque plate x Steering knuckle 11 8 1,200 87
\
\
Front disc brake cylinder installation bolt 34 350 25\

\

\
Front disc brake cylinder x Flexible hose bolt

30

310

22
\
\
Rear disc brake torque plate x Axle carrier 104 1,065 77
\
\
Rear disc brake cylinder installation bolt 34 350 25
\

\

\
Rear disc brake x Flexible hose union bolt

30

310

22
\
\
Parking brake lever x Floor 59 600 43
\
\
Parking brake cable No.1 x Floor 9 80 69 in.
Vlbf
\
\
Parking brake cable retainer x Floor 5.4 55 48 in. Vlbf\

\

\
Parking brake cable clamp x Floor

19

190

14
\
\
ABS actuator x Actuator bracket 5.4 55 48 in.
Vlbf
\
\
ABS actuator bracket x Body 19 195 14
\

\

\
Front speed sensor installation bolt

7.8

80

69 in.
Vlbf
\
\
Rear speed sensor installation bolt 7.8 80 69 in. Vlbf
\
\
TRAC pump bracket x Body 19 195 14
\
\
TRAC pump or accumulator x Union bolt 46 465 34
BR±230±
BRAKE SYSTEM SERVICE SPECIFICATIONS
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