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Condition
Squealing brakes
Chirping brakes
Dragging brakes
Hard pedal
Wheel locks
Brakes fade (high speed)
Pedal pulsates
Brake chatter and shoe knock
TROUBLESHOOTING
Possible Cause
1. Glazed brake lining.
2. Saturated brake lining.
3. Weak or broken brake shoe retaining spring.
4. Broken or weak brake shoe return spring.
5. Incorrect brake lining.
6.- Distorted brake shoes.
7. Bent support plate.
8. Dust in brakes or scored brake drums.
9. Linings worn below limit.
10. Uneven brake lining wear.
11. Heat spotted brake drums.
1. Out of round drum or eccentric axle flange pilot.
1. Incorrect wheel or parking brake adjustment.
2. Parking brakes engaged or improperly adjusted.
3. Weak or broken brake shoe return spring.
4. Brake pedal binding.
5. Master cylinder cup sticking.
6. Obstructed master cylinder relief port.
7. Saturated brake lining.
8.. Bent or out of round brake drum.
9. Contaminated or improper brake fluid.
10. Sticking wheel cylinder pistons.
11. Driver riding brake pedal.
12. Defective proportioning valve.
13. Insufficient brake shoe lubricant.
1. Brake booster inoperative.
2. Incorrect brake lining.
3. Restricted brake line or hose.
4. Frozen brake pedal linkage.
5. Stuck wheel cylinder.
6. Binding pedal linkage.
7. Faulty proportioning valve.
1. Contaminated brake lining.
2. Loose or torn brake lining.
3. Wheel cylinder cups sticking.
4. Incorrect wheel bearing adjustment.
5. Faulty proportioning valve.
1. Incorrect lining.
2. Overheated brake drums.
3. Incorrect brake fluid (low boiling temperature).
4. Saturated brake lining.
5. Leak in hydraulic system.
6. Faulty automatic adjusters.
1. Bent or out of round brake drum.
1. Out of round brake drum.
2. Loose support plate.
3. Bent support plate.
4. Distorted brake shoes.
5. Machine grooves in contact face of brake drum (Shoe Knock).
6. Contaminated brake lining.
7. Missing or loose components.
8. Incorrect lining material.
9. Out-of-round brake drums.
10. Heat spotted or scored brake drums.
11. Out-of-balance wheels.
309
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