Discussion
Which shoe in a leading and trailing drum brake does most of the work?
Answer: B
Rotation drags the leading shoe into tighter contact, giving a self energising effect, while the trailing shoe is pushed away. The leading shoe therefore wears faster. Two leading shoe designs use the effect on both. The shared behaviour explains why these belong together and the differences explain why both exist. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Tracing the requirement back to the physical constraint that produces it makes the answer follow.
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