Avenger L4-2.4L (2009)
Rotor thickness variation measurements should be made in conjunction with measuring runout. Measure thickness of the brake rotor (2) at 12 equal
points around the rotor braking surface with a micrometer (1) at a radius approximately 25 mm (1 inch) from edge of rotor. If thickness measurements
vary beyond the specification listed in the specification table See: Specifications , the rotor should be refaced or replaced. See: Service and
Repair/Procedures.
ROTOR RUNOUT
On-vehicle rotor runout is the combination of the individual runout of the hub face and the runout of the brake rotor (hub runout can be measured
separately). To measure rotor runout on the vehicle:
1. Raise and support the vehicle. See: Maintenance
2. Remove the tire and wheel assembly. See: Maintenance/Wheels and Tires/Service and Repair/Removal and Replacement/Tires and Wheels -
Removal
3. Install standard wheel mounting nuts, flat side to rotor, on all the wheel studs (2). Progressively tighten the nuts in a crisscross pattern to 135 Nm
(100 ft. lbs.).
NOTE: Dial Indicator, Special Tool 9524, can be used in conjunction with C-3339A to measure in millimeters instead of inches. Dial indicator
9524 includes a finer scale to measure lower, tighter tolerances.
4. Mount Dial Indicator (1), Special Tool C-3339A, with Wheel, Special Tool 25W, or equivalent, to the knuckle. Position the dial indicator wheel
to contact the rotor braking surface approximately 10 mm (0.39 in.) from the outer edge of the rotor (3).
5. Slowly rotate the brake rotor checking lateral runout, marking the low and high spots. Record these measurements.
6. Check and record the runout on the opposite side of the rotor in the same fashion, marking the low and high spots.
7. Compare runout measurement to specifications.See: Specifications
8. If runout is in excess of specifications, check the lateral runout of the hub face. Before removing the rotor from the hub, place a chalk mark across
both the rotor (1) and the one wheel stud (2) closest to where the high runout measurement was taken. This way, the original mounting spot of the
rotor on the hub is indexed.
