Here is a good thread on the w123 vacuum Interlock Diagram.

http://www.peachparts.com/shopforum/diesel-discussion/160169-w123-vacuum-interlock-diagram.html

The big black plastic line from the Vacuum Pump (front of engine) to the brake Booster, it the main vac line. in the center is a couple nipples that the various sub systems get their source of vacuum.

Brown is to shut the engine down
Green is the AC/Heat CC system.
Yellow is for the door locks, and yellow grey stripe goes to the vac reservor.
there is a yellow pod the 2 lines connect to. this is a check valve.

The guy may have snapped off the plastic nipple from the main vac line.
The above thread should simplify it.


Charlie

__________________
there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works