Jeep J-10 Series 1982 Technical & Service Manual page 840

2G-48 BRAKES
^\ MAXIMUM RUNOUT
0.005 INCH (0.12 mm)
42889
Rg. 2G-56 Checking Lateral Runout
42890
Fig. 26-57 Checking Thickness Variation
(b) Take readings at four or more equally
spaced points around rotor circumference and one inch
(25 mm) inward from outer edge of rotor.
(c) Thickness variation, from point-to-point,
must not vary by more than limit stated in Rotor
Specifications.
(d) Refinish rotor if thickness variation exceeds
stated limit. Replace rotor if machining will not correct
variation or if machining would cause rotor to fall below-
minimum thickness specification.
NOTE: Excessive thickness variation will cause pedal
pulsation and vibration when the brakes are applied.
Rotor Refinishing
Rotor refinishing should only be performed using
equipment that will machine both of the rotor surfaces
simultaneously (machining one side at a time can pro
duce a tapered rotor). The correct surface finish is 15 to
80 microinches for CJ and Scrambler models; 20 to 60
microinches for Cherokee, Wagoneer and Truck models
and must not have tool marks (grooves; after machining
(fig. 2G-58).
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41182
Rg. 2G-58 Correct Rotor Finish (Nondirectlonal Crosshatch Pattern]
NOTE: If a rotor is glazed or highly polished, sanding
the rotor may not produce the required rotorfinish. It
may be necessary to turn the rotor to meet the finish
requirements.
To ensure a correct surface finish, follow the lathe
manufacturer's recommendations for feed and speed
and either sharpen or replace dull cutting tool bits be
fore machining rotor.
(1) Remove rotor from steering spindle.
(2) Remove bearings and seal from rotor and clean
bearing surfaces in rotor hub thoroughly.
(3) Mount rotor in lathe according to manufac
turer's instructions and install anti-chatter band.
(4) Sharpen or replace cutting tool bits as
necessary.
(5) Machine rotor as necessary and according to
lathe manufacturer's instructions only. Make two cuts if
required and do not remove more than 0.007 inch (0.1S
mm) at a time.
CAUTION: Do not attempt to refinish the rotor if ma
chining would cause the part tofall below the minimum
(replacement) thickness specification for that rotor. Re
fer to the Specifications section.
NOTE: If one disc brake assembly requires a newset of
brakeshoes, the shoes on the other assembly must also
be replaced to ensure even braking.
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