Tie Down Drum Brakes - Manual (Page 8)

Symptoms Possible Cause
Noise or brake chatter Improper brake adjustment.
Brake fluid or grease on lining.
Improperly adjusted or worn wheel bearing.
Drum out of round.
Dirt on drum or lining surface.
Dust in rivet holes.
Lining glazed or worn.
Scored drum.
Loose backing plate.
Weak or broken return springs.
Only one brake is activating Improper brake adjustment.
(see brake adjustment)
Brake line is restricted.
Improperly adjusted or worn wheel bearing.
Drum out of round.
Loose backing plate.
Faulty wheel cylinder.
Weak or broken shoe return spring.
Glazed or worn lining.
Loose lining.
Air in hydraulic system.
Dirty brake fluid.
All brakes drag Faulty actuator.
Mechanical resistance at actuator or shoes.
Brake lines restricted.
Dirty brake fluid.
Faulty back up solenoid (if used).
Brakes do not apply Leaks or insufficient brake fluid.
Air in hydraulic system.
Improper brake adjustment.
Faulty actuator.
Lining glazed or worn.
Brake fluid or grease on lining.
Dirty brake fluid.
Leaking wheel cylinder Check and replace wheel cylinder and
bleed brakes.
Seized wheel cylinder piston Check and replace wheel cylinder and bleed brakes.
Hydraulic Drum Brake Trouble Shooting
Page 7