I was bored and fooling around with a spare transmission vacuum control valve which had previously held vacuum(with a very very slight leakage) at 18" and diminished with the lever to around 4" at the stop, when I broke the thing I think. Now it only pumps to 16" and leaks down slightly quicker. The lever arm does take it down to zero though which is what I understand is normal operation. Is it supposed to hold vacuum indefinitely, and what is the max vacuum it should hold? I may have ruined a perfectly good valve but at least I know how it works now. Maybe.

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