Discussion
Which test checks a brake servo simply?
Answer: C
Pumping exhausts the reserve, and with the pedal held down the engine is started, whereupon a working servo pulls the pedal down noticeably. A vacuum gauge is a useful confirmation. A sinking pedal is a master cylinder test, not a servo one. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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