Does it have two small lines coming off of the main line to the booster? I leaned over my engine and placed my hand there and broke one of them clean off and didn't even realize i'd done it until the next time I tried to shut it off. Once I learned (and was amazed) that this car shut off with a vacuum system I started checking for leaks. Found that and the non-inky part of a pen insert and trusty JB Weld fixed it, after driving with it like that for a week till a buddy told me to try it.

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Seth

1984 300D 225K
1985 300D Donor body
1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!!
1980 300SD 311K My New Baby.
1979 BMW 633csi 62K+++? Dead odo