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When the brake cylinder pushes the two shoes apart, the leading shoe "wraps" with the rotating drum. This wrapping pushes the trailing shoe through the transfer bar into tighter contact with the drum providing the servo action.

Notice that your leading shoe nearly always has more brake lining than the trailing shoe and also notice that it requires more pedal effort to stop a car with drum brakes when it is going in reverse than it does when the car is moving the same speed in the forward direction.

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11y ago
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Anonymous

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3y ago
thankyou for this information it really helped with a question on my assignment :) 

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Q: What is the self-servo action on drum brakes?
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