Ryan, the rear brake hose leads from one end (pretty sure it's driver side) of the axle, from near the differential. On the axle, there'll be a tee fitting. The hose from the chassis, and the two steel lines leading to the wheels. Other end of the hose goes to the chassis.
When we did our old coach, we found one of the steel lines leaked. Probably didn't till we flexed it working on the cylinder. Replaced it with a length of straight brake line from the auto supply. You might need an extra foot or so. We had to roll one end into a loop to get it to get around the spring mountings and connect to the cylinder. Didn't look original, but all you have to do is get the fluid from and to, and not kink the new line or run it where it'll get pinched.
