Chrysler Vehicle User Manual page 240

TJ
ROTORS (Continued)
Machine the drum if runout or variation exceed
values. Replace the drum in hat rotor if machining
causes the drum in hat rotor to exceed the maximum
allowable diameter.
STANDARD PROCEDURE
STANDARD PROCEDURE - DISC ROTOR
MACHINING
The disc brake rotor can be machined if scored or
worn. The lathe must machine both sides of the rotor
simultaneously with dual cutter heads. The rotor
mounting surface must be clean before placing on the
lathe. Equipment capable of machining only one side
at a time may produce a tapered rotor.
NOTE: A hub mounted on-vehicle lathe is recom-
mended. This type of lathe trues the rotor to the
vehicles hub/bearing.
CAUTION: Brake rotors that do not meet minimum
thickness specifications before or after machining
must be replaced.
STANDARD PROCEDURE - BRAKE DRUM IN
HAT ROTOR MACHINING
The brake drum in hat rotor can be machined on a
drum lathe when necessary. Initial machining cuts
should be limited to 0.12 - 0.20 mm (0.005 - 0.008 in.)
at a time as heavier feed rates can produce taper and
surface variation. Final finish cuts of 0.025 to 0.038
mm (0.001 to 0.0015 in.) are recommended and will
generally provide the best surface finish.
Be sure the drum in hat rotor is securely mounted
in the lathe before machining operations. A damper
strap should always be used around the drum to
reduce vibration and avoid chatter marks.
The maximum allowable diameter of the drum
braking surface is stamped or cast into the drum in
hat rotor.
CAUTION: Replace the drum in hat rotor if machin-
ing will cause the drum to exceed the maximum
allowable diameter.
REMOVAL
REMOVAL - FRONT
(1) Remove wheel and tire assemble.
(2) Remove caliper. (Refer to 5 - BRAKES/HY-
DRAULIC/MECHANICAL/DISC BRAKE CALIPERS
- REMOVAL).
(3) Remove retainers securing rotor to hub studs
(Fig. 54).
(4) Remove rotor from hub.
(5) If rotor shield requires service, remove front
hub and bearing assembly.
Fig. 54 Rotor & Hub
1 - ROTOR
2 - RETAINER
3 - BEARING NUT
4 - NUT LOCK
5 - COTTER PIN
6 - WASHER
REMOVAL - REAR
(1) Raise and support the vehicle
(2) Remove the tire and wheel assembly (Fig. 55).
Fig. 55 ROTOR/CALIPER
1 - CALIPER
2 - ROTOR
3 - OUTBOARD DISC BRAKE PAD
BRAKES - BASE 5 - 31