I'm out @ our cabin & usually I would look In the book for this but its not here, I have a brake line that is leaking the hose that runs in the chasis & has that hard plastic shell like you put wiriing in,&it run from chassis by the rear drivers side..then to pass side which appears dry.
I need this fixed today so let me know if you have an idea of what line it is...I'm about to go snap pix

 

If we are talking about a RAM, Id say you need the rear brake hose. But a pick would help for sure.