ched to it.ponents are also attached to the backing plate,including a hydraulic cylinder and several springs and linkages.The brake shoes are lined with a frictional material.The frictional material contacts the inside of the drum when the brakes are applied (Figure 45-2).When the brakes are applied,the brake shoes are forced out and produce friction against the inside of the drum.РSHOE ENERGIZATIONР When the brakes are applied,it is important for the shoe to be self-energizing.When the brake shoe is engaged,the frictional drag acting around the shoe tends to rotate the shoe about its pivot as shown in Figure 45-3.When the drum rotates in the same direction,the frictional drag between the two causes the shoe to e tighter against the inside of the drum.This action is called self-energizing.
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