Hi all,

My car's vacuum has been getting progressively worse over the past months. It got really bad during the cold spell this winter, and I just have to do something.
I realized that one of the two nipples on the line that goes from the vacuum pump to the brake booster had broken off. Apparently the broken one was sealed, Id never hear noise from it or anything, but I got a new one of those and made the vacuum lines back to how they are supposed to be according to the performance products catalog.
I thought it was better, it always shuts off now, doors usually work when the car is on, the midle air vents open occasionally rather than never, etc., but the problem is now only this:
-when I turn off the car and leave it unlocked for more than a minute or two, I loose all locking vacuum and have to lock the doors manually.
-when I lock the car immediately, and then go to unlock it more than a day or two later,it wont unlock all the doors.

Any suggestions what this could be? Everything else is tight.
Do the vacuum reservoirs for locking go bad/crack? Is there a check valve on there that might be bad?
I would just assume find a spot and start replacing vacuum connections. I figure its good practice for the vacuum system, since the connections are all 20+ years old. Is there one central location where vacuum is transfered from the reservoir in the trunk to the six locking locations? a manifold of sorts? If I can find this and replace all those local vacuum conections, its a start thats cheap, easy, and will make me happy that I dont have 20 year old rubber in there (even if it does still hold vacuum)
Thanks very much,

JMH

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
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Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)