Chrysler PT Cruiser 2001 Service Manual Supplement page 129

5 - 18 BRAKES
DIAGNOSIS AND TESTING (Continued)
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 (1 inch) from edge of rotor (Fig. 28). Check lat-
eral runout on both sides of the rotor, marking the
low and high spots on both. Runout limits can be
found in the table at the end of this brake rotor
information.
Fig. 28 Checking Rotor Runout
1 – SPECIAL TOOL SP-1910
2 – 25mm 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. 29).
Remove the rotor from the hub.
NOTE: Clean the hub face surface before checking
runout. This provides a clean surface to get an
accurate indicator reading.
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
Fig. 29 Marking Rotor and Wheel Stud
1 – CHALK MARK
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. 30).
Fig. 30 Checking Hub Runout
1 – HUB SURFACE
2 – SPECIAL TOOL C-3339
3 – SPECIAL TOOL SP-1910
Hub runout should not exceed 0.08 mm (0.003
inch). If runout exceeds this specification, the hub
must be replaced. Refer to the SUSPENSION group
in this service manual for the replacement procedure.
PT