what kind of fitting do you use to tap into a brakeline?
You just need a couple universal brake lines from your local parts store. Screw them in were the soft line that runs to the axle screws in to the hard line on the frame. You aren't really tapping into the line, that was a poor choice of words. Like meaders said, it goes inline, and there is already a connection back there to plum it in with.
I would use it for an offroad brake, but on a daily driven rig I would want a real e brake.