Discussion
Which figure does a brake test express as a percentage?
Answer: D
Efficiency is the sum of the brake forces divided by the vehicle weight, and a service brake typically must reach fifty per cent. Imbalance is also a percentage and is a separate limit, which makes the second option a genuine near miss. Naming what changes and what stays the same is the reliable route through questions of this shape. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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