22-3. BRAKE ROTOR REPAIR
INITIAL SETUP:
Tools
General mechanic’s tool kit:
automotive (Appendix B, Item 1)
Dial indicator (Appendix B, Item 113)
Micrometer (Appendix B, Item 156)
Materials/Parts
Abrasive crocus cloth (Appendix C, Item 22)
Manual References
TM 9-2320-387-24P
Equipment Condition
Brake rotor removed (para. 7-12).
Maintenance Level
Direct support
This task covers:
a. Inspection
c.
Checking Thickness Variation
b. Checking Lateral Runout
d. Refinishing
NOTE
If rotor braking surfaces are rusted or scaled, they must be cleaned
before attempting inspection or measurement.
1.
Mount rotor (1) in brake lathe and turn while cleaning surfaces with abrasive crocus cloth.
2.
Inspect rotor (1) for heat cracks, nicks, scoring, discoloration, and pitting. Replace if damaged.
1.
Mount dial indicator with stylus contacting rotor (1) surface 1 in. (25 mm) in from outer edge.
2.
Turn rotor (1) 360° and note indicator reading.
3.
If lateral runout exceeds 0.004 in. (0.10 mm) total, replace or refinish rotor.
1.
Measure thickness variation of rotor (1) with a micrometer at four equally-spaced points around
rotor (1). Measure 1 in. (25 mm) in from outer edge.
NOTE
Rotor must be replaced if minimum thickness falls below 0.815 in.
(20.7 mm).
2.
If thickness variation exceeds 0.005 in. (0.13 mm), replace or refinish rotor (1).
1.
Mount rotor (1) on brake lathe and refinish surface.
2.
Replace rotor (1) if refinishing causes rotor (1) to fall below minimum thickness, 0.815 in. (20.7 mm).
d. Refinishing
c. Checking Thickness Variation
b. Checking Lateral Runout
a. Inspection
TM 9-2320-387-24-2
22-2
Change 1
