LEXUS LS430 2003 Factory Repair Manual

Fig. 73: Measuring Pad Lining Thickness
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
7.DISCONNECT FRONT FLEXIBLE HOSE
a. Remove the union bolt and gasket from the disc brake cylinder assy, then disconnect the front
flexible hose from the disc brake c
ylinder assy.

Fig. 74: Disconnecting Front Flexible Hose From Disc Brake Cylinder Assy
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
8.REMOVE DISC BRAKE CYLINDER ASSY LH
a. Remove the 2 bolts and disc brake c
ylinder assy from the knuckle.

Fig. 75: Removing Bolts And Disc Brake Cylinder Assy From Knuckle
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
9.REMOVE CYLINDER BOOT
a. Using a screwdriver, remove the cylinder boot from the disc brake cylinder assy.

Fig. 76: Removing Cylinder Boot From Disc Brake Cylinder Assy
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
10.REMOVE FRONT DISC BRAKE PISTON
a. Prepare a wooden plate to hold the pistons.

Fig. 77: Preparing Wooden Plate To Hold Pistons
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Place the plate between the pistons and insert a pad into one side.
c. Use compressed air to remove the pistons alternately from the disc brake cylinder assy.

Fig. 78: Removing Pistons Alternately From Disc Brake Cylinder Assy
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
11.REMOVE PISTON SEAL
a. Usin
g a screwdriver, remove the 4 piston seals from the disc brake cylinder assy.

Fig. 79: Removing Piston Seals From Disc Brake Cylinder Assy
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
12.REMOVE FRONT DISC BRAKE BLEEDER PLUG
a. Remove the front disc brake bleeder plug from the disc brake cylinder assy.
13.INSPECT DISC THICKNESS
a. Using a micrometer, measure the disc thickness.
Standard thickness: 30.0 mm (1.181 in.)
Minimum thickness: 28.0 mm (1.102 in.)
If the disc thickness is less than the minimum, replace the disc.

Fig. 80: Measuring Disc Thickness
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
14.REMOVE FRONT DISC
a. Put matchmarks on the front disc and the axle hub.
b. Remove the front disc.

Fig. 81: Identifying Matchmarks On Front Disc And Axle Hub
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
15.INSTALL FRONT DISC
a. Align the matchmarks, and install the front disc.
HINT:
When replacing the disc with a new one, select the installation position where the front disc has the
minimum runout.
16.INSPECT DISC RUNOUT
a. Ti
ghten the disc with the 3 hub nuts.

HINT:
Use SST 09330-00021 to hold the disc during measurement.
Torque: 103 N.m (1,050 kgf.cm, 76 ft.lbf)
Fig. 82: Tightening Disc With Hub Nuts

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Using a dial indicator, measure the disc runout 10 mm inside (0.39 in.) the outer edge of the disc.
Maximum disc runout: 0.05 mm (0.0020 in.)
c. If the runout exceeds the maximum value, change the installation positions of the disc and axle so
that the runout will become minimal. If the runout exceeds the maximum even when the installation
positions are changed, check the bearing play in the axial direction and the axle hub runout (see
ON
-VEHICLE INSPECTION ). If the bearing play and the axle hub runout are normal and if the
disc thickness is not within the specified range, shave the disc. If the disc thickness is less than the
minimum, replace the disc.