TM 9-2330-386-14&P
Section IV. BRAKE DRUMS MAINTENANCE
5-7 BRAKE DRUMS.
This task covers repair.
INITIAL SETUP
E q u i p m e n t Condition
Tools
Reference
Lathe, brake drum
General mechanics tool kit
S h o p equip auto repair, FM basic
Materials/Parts
C r o c u s cloth (item 2, Appendix E)
R a g s , wiping (item 11, Appendix E)
Solvent, dry cleaning (item 14, Appendix E)
WARNING
Dry cleaning solvent (P-D-680) is toxic and flammable.
Avoid prolonged breathing of vapors. Avoid skin contact.
Use only in a well ventilated area. Keep away from open
flame. Flash point of solvent is 138 F.
a. Clean brake drum (1) with dry cleaning solvent (P-D-680).
b. Check brake drum (1) for wear, cracks, or damage. Replace, if necessary.
NOTE
Slight scoring condition can be corrected by polishing
with crocus cloth. Heavy scoring and out-of-round
conditions require turning brake drum on a refinishing
lathe.
c. Check inner braking surface (2) for cracks, heat checking, scoring, pitting,
o r warpage.
d. Using micrometer, check inside of brake drum (1) for out-of-round or tapered
wear. Take four readings in the sequence shown.
e. Record each reading. The maximum difference between the four readings must not
e x c e e d 0.0006 inch. Drums with out-of-round exceeding limits must be turned on
a refinishing lathe.
5-8