The vac stuff seems normal, no hard brakes, can hear actuators going in response to A.C. settings, pretty sure it's the shutoff. But still confused as to some of the search results where there are concerns about oil coming up the line from the pump, I can see how it would go from the I.P. to the pump, but the other way? Guess I'll be getting a Mityvac, the guy I used to borrow one from at work quit....

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So far...'76 240 D (sold)
'84 300SD (sold)
'85 300D (sold)
'83 300SD (p.o.s. waiting on tranny swap)
'82 300SD (could be the keeper)