Discussion
Which purpose does a retarder serve on a heavy vehicle?
Answer: D
Continuous use of friction brakes on a descent overheats them, so a retarder absorbs the energy and keeps the service brakes fresh for emergencies. Spring brakes provide the emergency function. The distinction is fundamental to descent technique. Naming what changes and what stays the same is the reliable route through questions of this shape. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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