Discussion
Which component holds vacuum in the servo when the engine stops?
Answer: A
The one way valve traps the depression so one or two assisted applications remain after the engine stops. Separate reservoirs are fitted to some vehicles but not to all. A failed valve is detected by the loss of that reserve. The order in which the effects act is what decides the outcome, so it is worth establishing first. The shared behaviour explains why these belong together and the differences explain why both exist. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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