Tie Down Drum Brakes - Manual (Page 10)

Brake Adjuster
Dust Plugs
Upper Return
Spring
Secondary Pad
Lower Return Spring
Magnet & Spring
Hold Down
Spring
Assembly
Hold Down
Spring
Assembly
Primary Pad
Actuating Level
Arm
Wheel Adjuster Assembly
Dust Plugs
Retainer Washer
Wheel Cylinder Assembly
Upper Return
Spring
Right Brake Pad
(Trailing Shoe)
Left Brake Pad
(Leading Shoe)
Lower Return Spring
Rear Upper
Return Spring
Hold Down
Spring
Assembly
Hold Down
Spring
Assembly
Shoe Pin
Adjuster Shim
Return Spring
Brake Adjuster
Dust Plugs
Actuating Cam
Upper Return
Spring
Secondary Pad
Lower Return Spring
Magnet & Spring
Hold Down
Spring
Assembly
Hold Down
Spring
Assembly
Primary Pad
Actuating Level
Arm
Return Spring
Electric Drum Brake Trouble Shooting
Symptoms Possible Cause
Noise or brake chatter Improper brake adjustment.
Oil or grease on lining.
Improperly adjusted or worn wheel bearing.
Drum out of round.
Dirt on drum or magnet 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)
Improperly adjusted or worn wheel bearing.
Drum out of round.
Loose backing plate.
Weak or broken shoe return spring.
Glazed or worn lining.
Loose lining.
Bad connection at tow vehicle.
Broken or disconnected wire.
Bad magnet.
Dirt or grease inside hub surface.
All brakes drag Faulty or improperly adjusted brake controller.
Improperly wired brake connection.
Mechanical resistance at actuator or shoes.
Brakes do not apply
Faulty brake controller.
Improperly adjusted brake controller.
Brake wires not connected to tow vehicle.
Bad Magnets.
Improper brake adjustment.
Lining glazed or worn.
Dirt or grease inside hub surface.
Damaged wiring.
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