Discussion
Which source supplies the vacuum for a brake servo on a petrol engine?
Answer: C
A throttled petrol engine produces substantial manifold depression at part throttle, which is tapped through a non return valve. Diesel engines have no throttle and need a pump. That is the essential difference between the two installations. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. The order in which the effects act is what decides the outcome, so it is worth establishing first. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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