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Home >> Lexus >> 2008 >> LS 460 V8-4.6L (1UR-FSE) >> Repair and Diagnosis >> Brakes and Traction Control >> Disc Brake System >> Testing and Inspection >> Front Brake
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Front Brake








BRAKE: FRONT BRAKE: INSPECTION

INSPECTION

1. CHECK BRAKE CYLINDER AND PISTON
(a) Check the cylinder bore and piston for rust or scoring. If necessary, replace the disc brake caliper assembly.
2. CHECK PAD LINING THICKNESS






(a) Using a ruler, measure the pad lining thickness.
Standard thickness:
13.5 mm (0.532 in.)
Minimum thickness:
1.0 mm (0.0394 in.)
If the pad lining thickness is less than the minimum, replace the pad.
HINT: Be sure to check the wear on the front disc after replacing the brake pad with a new one.

3. CHECK FRONT DISC BRAKE ANTI-RATTLE SPRING
(a) Use brake cleaner to clean the front disc brake anti-rattle spring. Check for deformation and cracks.
(b) When installing the front disc brake anti-rattle spring to the front disc brake caliper, check that the spring's force is applied to the hole pin and brake pad.
4. CHECK DISC THICKNESS






(a) Using a micrometer, measure the disc thickness.
Standard thickness:
13.14 inch disc
30.0 mm (1.181 in.)
14.06 inch disc
34.0 mm (1.339 in.)
Minimum thickness:
13.14 inch disc
27.0 mm (1.063 in.)
14.06 inch disc
31.0 mm (1.221 in.)
If the disc thickness is less than the minimum, replace the disc.
5. CHECK DISC RUNOUT






(a) Using SST to hold the disc, fix the disc in place with the 5 hub nuts.
SST: 09330-00021
Torque: 140 Nm (1428 kgf-cm, 103 ft-lbf)






(b) Using a dial indicator, measure the disc runout 10 mm inside (0.39 in.) the outer edge of the disc.
Maximum disc runout:
0.04 mm (0.0016 in.)
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 looseness in the axial direction Front Axle Hub and the axle hub runout Front Axle Hub. If the bearing looseness and the axle hub runout are normal, and if the disc thickness is not within the specified range, grind the disc. If the disc thickness is less than the minimum, replace the disc.
(c) Remove the front disc.
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