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SYMPTOM
5. Vehicle pulls to one
side.
6. Noise and chatter.
7. Pulsating brake
pedal.
8. Decreasing pedal
travel.
DRUM BRAKE TROUBLESHOOTING
CAUSE
6. Scored, hard spotted or out of
round drums.
7. Rough or corroded master
cylinder bore.
8. Binding brake pedal linkage.
9. Faulty power brake unit.
1. Incorrect or distorted shoes.
2. Incorrect linings or linings loose
on shoes.
3. Grease or brake fluid on linings.
4. Shoes not centered in drums.
5. Loose or distorted backing plate
(dirtshield).
6. Scored, hard spotted, or out of
round drums.
7. Water on linings.
8. Sticking wheel cylinder piston.
9. Faulty suspension parts.
1. Bent, damaged, or incorrect
shoes.
2. Worn linings.
3. Broken shoe return spring.
4. Rough, grooved, or dry shoe
abutment surfaces or steady
post on dirtshield.
5. Cracked or threaded drums.
1. Out of round drums.
2. Bent axle.
3. Worn or damaged wheel
bearings.
4. Defective master cylinder.
5. Brakes overadjusting.
1. Weak or broken shoe return
spring.
2. Sticking wheel cylinder piston.
REMEDY
6. Refinish or replace drums in
axle sets.
7. Refer to vehicle service manual.
8. Refer to vehicle service manual.
9. Refer to vehicle service manual.
1. Replace with correct shoes in
axle sets.
2. Replace with correct shoes in
axle sets.
3. Replace grease seal, wheel
cylinder or expander as
necessary. Replace brake shoes
in axle sets.
4. Adjust steady post.
5. Tighten or replace backing plate
(dirtshield).
6. Refinish or replace drums in
axle sets.
7. Apply brakes several times to
dry linings.
8. Replace or repair wheel cylinder.
9. Refer to vehicle service manual.
1. Replace with correct shoes in
axle sets.
2. Replace with correct shoes in
axle sets.
3. Replace shoe return springs.
4. Smooth shoe abutment surfaces
and steady post with emery
cloth and lubricate with brake
lubricant.
5. Replace drums in axle sets.
1. Refinish or replace drums in
axle sets.
2. Refer to vehicle service manual.
3. Refer to vehicle service manual.
4. Refer to vehicle service manual.
5. Adjust brake shoes and repair
automatic adjuster if necessary.
1. Replace shoe return springs.
2. Repair or replace defective wheel
cylinder.
15
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