Chrysler Concorde 1993 Service Manual page 142

5 - 48 BRAKES
Fig. 5 Checking Disc for Thickness
REFINISHING BRAKING DISC
REFACING BRAKING DISC
Refacing of the braking disc is not required each
time the shoe assemblies are replaced.
If the braking disc surface is deeply scored or
warped or there is a complaint of brake roughness or
brake pedal pulsation the rotor should be resurfaced
or refaced (Figs. 6 and 7).
When refacing a braking disc the required 0.08
mm (0.003 inch) TIR (Total Indicator Reading) and
0.013 mm (0.0005 inch) thickness variation limits
MUST BE MAINTAINED. Extreme care in the op-
eration of braking disc turning equipment is re-
quired.
The collets, shafts and adapters used on the brake
lathe and the bearing cups in the rotor MUST be
clean and free from any chips or contamination.
When mounting the disc on the brake lathe, strict
attention to the brake lathe manufacturer's operat-
ing instructions is required.
If the disc is not mounted properly the run-out will
be worse after refacing than before refacing.
The use of a double straddle cutter (Fig. 6) that
machines both sides of the disc at the same time is
highly recommended.
RESURFACING BRAKING DISC
This operation can be used when the disc surface is
rusty or has lining deposits.
A sanding disc attachment will remove surface con-
tamination without removing much braking disc ma-
terial.
Fig. 6 Refacing Braking Disc
Fig. 7 Resurfacing Braking Disc (Final Finish)
It will generally follow variations in thickness that
are in the disc.
The following chart shows the location of measure-
ments and specifications when servicing the braking
disc.
All front braking discs have markings for mini-
mum allowable thickness cast on an un-
machined surface of the braking disc (Fig. 8). The