I recently rpaird the vacuum door lock system on my 83 240D. The check valve was dead in the engine compartment, and one line was misrouted from when I reinstalled engine fter rebuilding. The system was working 1/2 fine--it only worked when car was running, not after motor stopped.I was going to finish fixing in springtime when i got warmer.

Also, the other day, the passenger door refused to lock, and I had to pull the vacuum lines from the rubber 4 way connectors in the floor to bleed it. There was still quite a bit of vacuum there.

Are my lines misrouted? Do i have to adjust the door vacuum switch? I hate messing with Mercedes trim, I'm scared of scartching it!!!

I have seen the vacuum reservoir leak. It is in the trunk on yours, I think.

You have a leak for sure.

The CD should have all of the routing information on it.

Just a suggestion for a quick fix
 

Greetings All,

I think Don is right, you have a leak in the reservoir. I've tinkered with mine to get all vacuum valves to work properly. I think if you pressurize the holding cell with compressed air, (don't get carried away now), you can probably do a soap and water leak test on the holding cell. A little JB weld on the leak if you find one will probably fix your problem. If you find no leak please respond back for additional help.

Charles