I beleive my problem is a bad pump, and these are expensive. That is why i havn't fixed it. I checked all doors/lines for leaks, and none were present. Also, on my 83 there isn't even a vacuum line running to the driver's side, as the driver's side lock is the only lock that activates the central locking system. I beleive on the 85 and up ones you can lock/unlock the entire car from the driver or passenger side, and the trunk. i could be mixed up on some of my info though. Hope this helps
Ryan

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83 300SD.......sold
96 integra SE....sold
99 a4 quattro....sold
2001 IS300.......sold
2002 330i.........current.
2004 highlander limited....current.