My 240D has the following symptoms (as of this morning): Won't Shutoff, Brakes hard, locks don't work too well. I checked for gross leaks and found none. Disconnected the main line and hooked the mity vac up to the main vacuum line off the vacuum pump with no users, and I get 5" of Hg vacuum at idle and a max of 10" at high throttle. My thinking was the vacuum pump had failed, but it is obvious that it has not completely failed. It certainly won't pull 20" of vacuum, as most of the troubleshooting posts seem to indicate it should. I never did see anywhere where it was stated what the performance should be. My expectation was a vacuum pump would fail completely, not partially.

Can anyone help me out? Is my vacuum pump the problem, or should I continue the search for leaks.

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1976 240D
1987 560SL
2007 E320 Bluetec
1998 C280 (now son’s car)
1982 240D Manual - Sold