Discussion
Which advantage does a drum brake retain?
Answer: A
The leading shoe is dragged into the drum by friction, multiplying the applied force, and a mechanical parking brake is easily arranged within the drum. Enclosure actually traps water and makes wet performance worse once water has entered. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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