Chrysler Concorde 2004 Service Manual page 1515

LH
ROTOR (Continued)
ROTOR THICKNESS VARIATION
Thickness variation in a rotor's braking surface
can result in pedal pulsation, chatter and surge. This
can also be caused by excessive runout in the rotor or
the hub.
Rotor thickness variation measurements should be
made in conjunction with measuring runout. Mea-
sure thickness of the brake rotor at 12 equal points
around the rotor braking surface with a micrometer
at a radius approximately 25 mm (1 inch) from edge
of rotor (Fig. 85). If thickness measurements vary by
more than 0.013 mm (0.0005 inch), the rotor should
refaced or replaced. (Refer to 5 - BRAKES - BASE/
HYDRAULIC/MECHANICAL/ROTORS
DARD PROCEDURE)
Fig. 85 Checking Rotor Thickness
1 - MICROMETER
ROTOR RUNOUT
On-vehicle rotor runout is the combination of the
individual runout of the hub face and the runout of
the rotor. (The hub and rotor runouts are separable).
To measure rotor runout on the vehicle, first remove
the tire and wheel assembly. Reinstall the wheel
mounting nuts on the studs, tightening the rotor to
the hub. Mount the Dial Indicator, Special Tool
C-3339, with Mounting Adaptor, Special Tool SP-
1910 on steering arm. The dial indicator plunger
should contact braking surface of rotor approximately
25 mm (one inch) from outer edge of rotor (Fig. 86).
Check lateral runout on both sides of the rotor,
marking the low and high spots on both. Runout lim-
its can be found in the table at the end of this brake
rotor information.
- STAN-
1 - SPECIAL TOOL SP-1910
2 - 25mm (1 INCH) FROM EDGE
3 - DISC SURFACE
4 - SPECIAL TOOL C-3339
If runout is in excess of the specification, check the
lateral runout of the hub face. Before removing the
rotor from the hub, place a chalk mark across both
the rotor and the one wheel stud closest to where the
high runout measurement was taken. This way, the
original mounting spot of the rotor on the hub is
indexed (Fig. 87).
Fig. 87 Marking Rotor and Wheel Stud
1 - CHALK MARK
Remove the rotor from the hub.
BRAKES - BASE BRAKE SYSTEM 5 - 49
Fig. 86 Checking Rotor Runout