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Front Brake Disc Inspection
Runout
1. Raise the front of the vehicle, and support it with
safety stands in the proper location (see page 1-8).
Remove the front wheels.
2. Remove the brake pads (seepage 19-11).
3. Inspect the disc surface for damage and cracks.
Clean the disc thoroughly, and remove all rust.
4. Install suitable flat washers (A) and wheel nuts, and
tighten the nuts to the specified torque to hold the
brake disc securely against the hub.
108N·m
111.0 kgl·m,
801bl·ltl
5. Set up the dial gauge against the brake disc as
shown, and measure the runout at 10 mm (0.4 in.)
from the outer edge of the disc.
Brake Disc Runout:
Service Limit:
0.10
mm
(0.004
in.)
6. If the disc is beyond the service limit, refinish the
brake disc.
Max. Refinish Limit:
19.0
mm
(0.75
in.)
NOTE:
• If the brake disc is beyond the service limit for
refinishing, replace it (see page 18-11).
• A new disc should be refinished if its runout is
greater than 0.10 mm (0.004 in.).
Thickness and Parallelism
1. Raise the front of the vehicle, and support it with
safety stands in the proper location (see page 1-8).
Remove the front wheels.
2. Remove the brake pads (see page 19-11).
3. Using a micrometer, measure disc thickness at
eight points, approximately
45'
apart and 10 mm
(0.4
in.) in from the outer edge of the disc.
Brake Disc Thickness:
Standard:
20.9-21.8
mm
(0.82-0.86
in.)
Max. Refinishing Limit:
19.0
mm
(0.75
in.)
Brake Disc Parallelism:
0.015
mm
(0.0006
in.)
max.
NOTE: This is the maximum allowable difference
between the thickness measurements .
4. If the smallest measurement is less than the max.
refinishing limit, replace the brake disc (see page
18-111.
5. If the disc is beyond the service limit for parallelism,
refinish the brake disc with an on-car brake lathe.
The Kwik-Lathe produced by Kwik-way
Manufacturing Co. and the "Front Brake Disc
Lathe" offered by Snap-on Tools Co. are approved
for this operation .
19-13
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