Emergency Parking Brake Release Vacuum Leak Question

[fordnmerc]

I was reading a bit about this on here from a thread from 6 years ago, but there was no photo included of the Emergency Parking Brake Release Switch, so I took a photo this morning that I figured folks would appreciate.

Question: Is it the white line that needs to be plugged and tied up out of the way? If so, can the black line be just left alone and ignored?

Thanks.

[gadget73]

I don't remember which line, but if you unplug it while the engine is running its easy enough to ID. Plug the vacuum line, the other one can just be left alone.

[sly]

Plug the black one. That's the vacuum source from the firewall. The white one is the one to the actuator.

[fordnmerc]

Many Thanks!