MB made improvements throughout the years, some years more than others.
24 is good, disconnected lines won't hold anything by definition. The black line going to the tranny should hold vac for a few minutes.
You'll have to ask Gene wilder about some of the hook ups, ha-ha.

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83 SD

84 CD

This is an OLD Post and one of my first from 2 years ago, but I FINALLY got around to going through my entire vacuum system. After following every vacuum line for the central lock system I traced my leak down to 2 broken lines in the rear hatch where the hatch is connected to the car. I pulled up assorted pics that everyone left for me here and links and the car shuts off and shifts smoothly. The AC system is still disconnected because there's something keeping it from working and its too much bother for me. Thanks for the help!! I had so much fun locking and unlocking my doors on the way home. I felt like a kid.

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2022 Nissan Frontier Pro4x
1990 Mercedes 420SEL
1950 Packard 8

Previous German cars-
2001 Mercedes SL500
1983 Mercedes 300SD
2011 BMW 328i (manual)
2008 BMW 535xi (manual)
2006 BMW M3 (manual)
1980 Mercedes 300TD
2006 BMW 750i
1996 Mercedes E300D
1994 BMW 740i
2006 BMW 330xi (manual)
1999 E300DT Smoke silver/black 253k
2012 BMW 535i Xdrive M-Sport
1984 300TD-T 304k
1988 Mercedes 560SEL (parts car)
2010 BMW 550i xdrive
2017 Audi A4 Presitge
1979 300SD 313k
2003 E500 189k