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Question for the gurus:

When the engine is off in our cars, there's still vacuum to operate the brakes another 5+ times, and this vacuum can last quite a while so long as one doesn't press the brake pedal too many times.

It appears our cars have two MAP sensors - one on the throttle body and one in-line with the vacuum hose going to the brake master. This second one is (presumably) to restart the engine when vacuum gets too low at the brake master.

So, to me, this suggests there is a check valve somewhere, which keeps vacuum in the like going to the brake master. Where is it? Is it part of the intake manifold?

Reason I ask, with my K24 engine I immediately lose brake vacuum as soon as the engine is off, and I'm looking to set up a sort of auto-stop system for it. I could just add a check valve somewhere, but I would like to know how the OEM system worked.
 

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Just throw out an anchor for the time being.
(Damn Meds)
 
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