Discussion
Which provision does a diesel engine need for its brake servo?
Answer: D
An unthrottled diesel produces almost no manifold vacuum, so a mechanical pump driven from the camshaft or the alternator supplies it. Electric pumps are used on stop start and hybrid vehicles. The pump is a common failure item. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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