Drum Shoe Pads
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An often overlooked area that requires servicing is the backing plate pads that support the brake shoes. The brake shoe shown in the illustration has three tabs. The shoe is pulled against the backing plate by the retaining spring and these tabs bear on three raised pads on the surface of the backing plate. As they move outward and rotate during braking, the tabs on the shoes slide across these pads.
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The pads must be well lubricated. If they are not, undesirable friction may occur. If there is friction, the movement of the shoe may score grooves in the pad, grooves that may affect performance over time.
