Dodge ZB 2005 Service Manual page 158

ZB
ROTOR (Continued)
Mount Dial Indicator, Special Tool C-3339, and
Mounting Adaptor, Special Tool SP-1910, to the steer-
ing knuckle. Position the indicator stem so it contacts
the hub face near the outer diameter. Care must be
taken to position stem outside of the stud circle, but
inside of the chamfer on the hub rim (Fig. 52).
Fig. 52 Checking Hub Runout
1 - HUB SURFACE
2 - SPECIAL TOOL C-3339
3 - SPECIAL TOOL SP-1910
Rotate the hub one full revolution (360°) noting the
minimum to maximum runout of the hub face. Hub
runout should not exceed 0.08 mm (0.003 inch). If
runout exceeds this specification, the hub and bear-
ing must be replaced. (Refer to 2 - SUSPENSION/
FRONT/HUB / BEARING - REMOVAL) (Refer to 2 -
SUSPENSION/REAR/HUB / BEARING - REMOVAL)
If the hub runout does not exceed this specifica-
tion, install the rotor back on the hub, aligning the
chalk marks on the rotor with the wheel mounting
stud that is directly across (or 180°) from the original
stud. Install and tighten all six wheel mounting nuts
securing the rotor to the hub in the proper sequence
Torque the nuts to specifications.
Recheck brake rotor runout to see if the runout is
now within specifications. (Refer to 5 - BRAKES/HY-
DRAULIC/MECHANICAL/ROTOR
TIONS)
If runout is not within specifications, reface or
replace the brake rotor. (Refer to 5 - BRAKES/HY-
DRAULIC/MECHANICAL/ROTOR
PROCEDURE).
STANDARD PROCEDURE - BRAKE ROTOR
MACHINING
NOTE: Refacing the rotor is not required each time
the brake pads are replaced, only when the need is
foreseen.
Any servicing of the rotor requires extreme care to
maintain the rotor within service tolerances to
ensure proper brake action.
If the rotor surface is deeply scored or warped, or
there is a complaint of brake roughness or brake
pedal pulsation, the rotor should be refaced using a
hub-mounted
replaced.
1 - ON-CAR BRAKE LATHE
The use of a hub-mounted on-car brake lathe is
highly recommended to eliminate the possibility of
excessive runout. It trues the brake rotor to the vehi-
cle's hub and bearing.
NOTE: All rotors have markings for minimum allow-
able thickness cast on an un-machined surface of
the rotor (Fig. 54).
Minimum allowable thickness is the minimum
thickness which the brake rotor machined surface
may be cut to.
CAUTION: Do not machine the rotor if it will cause
the rotor to fall below minimum thickness.
Before lathe installation, verify the brake rotor
- SPECIFICA-
face and the hub adapters are free of any chips, rust,
or contamination.
When mounting and using the brake lathe, strict
attention to the brake lathe manufacturer's operating
- STANDARD
instructions is required.
BRAKES - BASE 5 - 33
on-car brake lathe
Fig. 53 On-Car Brake Lathe
(Fig. 53), or