What's with the brown vacuum line?

I have a leak-down on a solid brown vacuum line on my 85 300TD. Any know where this line goes? Thanks, Paul

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Chassis Model Number

W123

Brown vacuum line

If its the one I'm thinking of you'll find one end goes to the vacuum valve on the back of the ignition switch. The brown with blue stripe (second line on the ignition switch) comes back to the fuel cut off soleniod on the rear of the fuel injection pump. Paul

The brown line

The brown line is the one that operates the engine shut off valve. It is routed from the engine compartment to the vacuum valve just behind the ignition switch, and another brown line (one of them has a stripe on it?) comes out of the switch, goes back into the engine compartment and is connected to the injection pump shut off valve.

the brown line

Thanks, I pulled the under dash panel to check the connections and tested the shut off valve at the pump. Looks like the switch has a slow leak, but the engine shuts off quickly. Thanks for the help, Paul