Thickness and Run Out Check - Brake Disc - Front

Thickness and Run Out Check Brake Disc - Front

Service Repair No - 70.10.15.01

Check
1. Raise front of vehicle.

WARNING: Do not work on or under a vehicle supported only by a jack. Always support the vehicle on safety stands.

2. Remove road wheel.





3. Remove, and discard, 2 bolts securing brake caliper to hub. Release caliper from hub and tie aside.

CAUTION: Do not allow caliper to hang on brake hose.





4. At 4 points around disc, measure disc thickness using a micrometer; renew disc if less than service limit of if maximum variation is exceeded: Disc thickness, NEW = 30 mm. Service limit = 28.4 mm. Thickness variation, maximum = 0.010 mm.

CAUTION: Brake discs must be renewed in pairs, unless one disc requires changing before 1000 miles (1500 kilometers) from new.





5. Mount a Dial Test Indicator (DTI) to LRT-99-503, and secure to inboard side of hub using caliper assembly upper bolt hole.
6. Position DTI probe 5 mm in from outer edge of disc.
7. Fit road wheel and tighten nuts to 140 Nm (103 ft. lbs.).
8. Zero DTI and rotate road wheel one complete revolution to measure disc run out. Disc run out must not exceed 0.073 mm.
9. If disc run out is outside limits, carry out the following procedure.

Adjust
1. Remove road wheel.





2. Remove Allen screw securing brake disc to drive flange.
3. Remove brake disc.
4. Ensure mating surfaces of disc and drive flange are clean.
5. Fit disc to flange, fit Allen screw and tighten to 16 Nm (12 ft. lbs.).
6. Fit road wheel(s) and tighten nuts to 140 Nm (103 ft. lbs.).
7. Check disc run out as detailed above.
8. If run out is still outside limits, renew disc and/or hub.
9. Remove road wheel.
10. Remove DTI and LRT-99-503.
11. Position caliper to hub, fit new bolts and tighten to 50 Nm (37 ft. lbs.), plus a further 60°.
12. Fit road wheel and tighten nuts to 140 Nm (103 ft. lbs.).
13. Depress brake pedal several times to set brake pads.
14. Remove stands and lower vehicle.