1991 LEXUS SC300 boot

3. REMOVE FOLLOWING PARTS:
(a) 2 anti±squeal springs
(b) 2 brake pads
CALIPER DISASSEMBLY
BR0EP±04
1. REMOVE CYLINDER BOOT SET RING AND CYLINDERBOOT
Using a screwdriver, remove the cylinder boot set ring and
cylinder boot from the caliper.
2. REMOVE PISTON
(a) Place a piece of cloth or similar article between the piston and
the caliper.
(b) Use compressed air to remove the piston from the caliper.
CAUTION: Do not place your fingers in front of the piston when
using compressed air.
3. REMOVE PISTON SEAL Using a screwdriver, remove the piston seal from the caliper.
4. REMOVE SLIDING PINS AND DUST BOOTS
(a) Remove the 2 sliding pins from the torque plate.
BR±40
±
BRAKE SYSTEM REAR BRAKE (Disc Brake)
WhereEverybodyKnowsYourName

(b) Using a screwdriver and hammer, tap out the 2 dust boots.
REAR BRAKE COMPONENTS
INSPECTION AND REPAIR
BR04B±06
1. MEASURE PAD LINING THICKNESSUsing a ruler, measure the pad lining thickness.
Standard thickness:
10.0 mm (0.394 in.)
Minimum thickness: 1.0 mm (0.039 in.)
Replace the pad if the pad's thickness is at the minimum
thickness or less, or if the pad has severely uneven wear.
2. MEASURE DISC THICKNESS
Using a micrometer, measure the disc thickness.
Standard thickness:
16.0 mm (0.630 in.)
Minimum thickness:
15.0 mm (0.591 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 scored or is worn unevenly.
3. MEASURE DISC RUNOUT
Measure the disc runout at 10 mm (0.39 in.) from the outer
edge of the disc.
Maximum disc runout:
0.05 mm (0.0020 in.)
If the disc's runout is at the maximum value or greater, check
the bearing play in the axial direction and check the axle hub
runout (See page SA±52). If the bearing play and axle hub
runout are not abnormal, adjust the disc runout.
4. IF NECESSARY, ADJUST DISC RUNOUT
(a) Remove the 2 bolt and torque plate from the carrier.
(b) Remove the hub nuts and the disc. Reinstall the disc 1/5 of
a turn round from its original position on the hub. Install and
torque the hub nuts.
Torque: 103 N Vm (1,050 kgf Vcm, 76 ft Vlbf)
Remeasure the disc runout. Make a note of the runout and
the disc's position on the hub.
±
BRAKE SYSTEM REAR BRAKE (Disc Brake)BR±41
WhereEverybodyKnowsYourName

(c) Repeat (b) until the disc has been installed on the 3remaining 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.
(f) Install the torque plate and tighten the 2 bolts.
Torque: 104 N Vm (1,065 kgf Vcm, 77 ft Vlbf)
CALIPER ASSEMBLY
BR0EQ±04
1. APPLY LITHIUM SOAP BASE GLYCOL GREASE TO
PARTS INDICATED WITH ARROWS
2. INSTALL DUST BOOTS AND SLIDING PINS
(a) Using a 19 mm socket and hammer, tap in 2 new dust boots into the torque plate.
(b) Confirm that the metal plate portion of the dust boot fits snugly in the torque plate.
(c) Insert 2 sliding pins into the torque plate.
NOTICE: Insert the sliding pin with the sliding bushing into the
bottom side.
BR±42±
BRAKE SYSTEM REAR BRAKE (Disc Brake)
WhereEverybodyKnowsYourName

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
WhereEverybodyKnowsYourName

10. DISCONNECT COLD START INJECTOR CONNECTOR
11. DISCONNECT RH CAMSHAFT POSITION SENSORCONNECTOR
(a) Disconnect the connector from the ignition coil bracket.
(b) Disconnect the camshaft position sensor connector.
12. D I S C O N N E C T L H C A M S H A F T P O S I T I O N S E N S O R
CONNECTOR
13. DISCONNECT HIGH±TENSION CORDS FROM SPARK PLUGS
Disconnect the high±tension cords at the rubber boot. Do not
pull on the cords.
NOTICE: Pulling on or bending the cords may damage the con-
ductor inside.
14. REMOVE SPARK PLUGS Using a 16 mm plug wrench, remove the 8 spark plugs.
±
1UZ±FE ENGINE ENGINE MECHANICALEG±39
WhereEverybodyKnowsYourName

wWhen replacing timing belt tensioner only:
To avoid meshing of the timing pulley and timing belt,
secure one of them with string. And place matchmarks
on the timing belt and RH camshaft timing pulley.
Alternately loosen the 2 bolts, and remove them, the belt ten-
sioner and dust boot.
29. DISCONNECT TIMING BELT FROM CAMSHAFT TIMING PULLEYS
(a) Using SST, loosen the tension spring between the LH and RH
camshaft timing pulleys by slightly turning the LH camshaft
timing pulley clockwise.
SST 09278±54012
(b) Disconnect the timing belt from the camshaft timing pulleys.
30. REMOVE CAMSHAFT TIMING PULLEYS Using SST, remove the bolt and timing pulley. Remove the 2
timing pulleys.
SST 09278±54012
EG±54
±
1UZ±FE ENGINE ENGINE MECHANICAL
WhereEverybodyKnowsYourName

(d) Using SST, align the timing marks of the LH camshaft timingpulley and timing belt rear plate.
SST 09278±54012
(e) C h e c k t h a t t h e t i m i n g b e l t h a s t e n s i o n b e t w e e n t h e
crankshaft timing pulley and LH camshaft timing pulley.
14. CONNECT TIMING BELT TO RH CAMSHAFT TIMING PULLEY
(a) Remove any oil or water on the RH camshaft timing pulley
and water pump pulley, and keep them clean.
(b) Using SST, slightly turn the RH camshaft timing pulley clockwise. Align the installation mark on the timing belt with
the timing mark of the camshaft timing pulley, and hang the
timing belt on the RH camshaft timing pulley.
SST 09278±54012
(c) Using SST, align the timing marks of the RH camshaft timing pulley and timing belt rear plate.
SST 09278±54012
(d) Check that the timing belt has tension between the RH camshaft timing pulley and LH camshaft timing pulley.
15. SET TIMING BELT TENSIONER
(a) Using a press, slowly press in the push rod using 981 ± 9,807
N (100 ± 1,000 kgf, 220 ± 2,205 lbf) of force.
(b) Align the holes of the push rod and housing, pass a 1.27 mm hexagon wrench through the holes to keep the setting
position of the push rod.
(c) Release the press.
(d) Install the dust boot to the belt tensioner.
±
1UZ±FE ENGINE ENGINE MECHANICALEG±63
WhereEverybodyKnowsYourName

6. REMOVE THROTTLE BODY WITH INTAKE AIRCONNECTOR
(a) Disconnect the following hoses and connectors:(1) PCV hose
(2) Three vacuum hoses
(3) VSV (for EGR) connector
(4) Throttle position sensor connector
(5) IAC valve connector
(6) (w/ TRAC)
Sub±throttle position sensor connector
(7) (w/ TRAC) Sub±throttle actuator connector
(8) (USA spec. only)
EGR gas temperature sensor connector
(b) Remove the four bolts and two nuts holding the intake air connector to the intake chamber.
(c) Remove the VSV nut.
(d) Disc onnect the two water by±pass hoses from the
throttle body. Plug the hose ends.
(e) Remove the throttle body with the intake air connector and gasket.
7. REMOVE NO. 3 TIMING BELT COVER AND CYLINDER
HEAD REAR COVER
(a) Remove the oil filler cap.
(b) Using a 5 mm hexagon wrench, remove the ten bolts,No. 3 timing belt cover and cylinder head rear cover.
8. DISCONNECT HIGH±TENSION CORDS FROM SPARK PLUGS
(a) Remove the bolt holding the cord clamp from thecylinder head.
(b) Disconnect the two high±tension cord clamps from the No. 3 cylinder head cover.
(c) Disconnect the high±tension cords at the rubber boot. Do not pull on the cords.
NOTICE: Pulling on or bending the cords may damage
the conductor inside.
±
ENGINE MECHANICAL Engine Tune±UpEM±11
WhereEverybodyKnowsYourName