10
9. Cracked lining at
A. Overtightening bolts.
A. Correct as required.
rivet holes or
B. Wrong type rivets or bolts.
B. Replace part.
bolt holes.
C. Rivets not properly crimped.
C. Replace lining.
D. Dirt or rust on shoe table.
D. Clean, remove dirt and debris.
E. Wrong size lining counter bore.
E. Replace linings.
10. Elongated rivet
A. Loose rivets or bolts.
A. Replace shoe and lining.
holes.
BRAKE DRUM TROUBLESHOOTING CHART
SYMPTOM
CAUSE
REMEDY
1. Brake drum heat
A. Out of round brake drum.
A. Turn, per manufacturer’s
checked.
specifications.
B. Eccentric mounting of drum.
B. Inspect wheel and drum and
replace defective part.
C. Loose wheel bearing.
C. Correct as required.
D. Glazed linings.
D. Replace linings.
E. Improper friction materials for duty
E. Consult vehicle manufacturer.
cycle of vehicle.
F. Overworked brake.
F. Check for proper brake balance.
(Ref; Bendix procedure to check
out system.)
G. Driver abuse.
G. Correct as required.
H Wrong drum, too light.
H. Replace part.
2. Excessive scoring
A. Defective brake lining.
A. Replace linings.
of drum.
B. Abrasive material between lining and
B. Clean, remove dirt and debris.
drum.
C. Soft drum.
C. Check hardness on flange. Should
be 187 Brinnel minimum.
D. Excessive lining wear, rivets
D. Replace lining.
contacting drum.
E. Drum not turned at last reline.
E. Turn per manufacturer’s
specifications.
F. Build up of abrasives in rivet holes.
F. Blow out debris.
