Diesel Bombers - need help with brakes

Hey guys, so I've got an issue with my truck that's starting to get worse and worse. I was driving a few weeks ago and the car in front of me locked up on its brakes thanks to a guy pulling out in front of him. I slammed on mine and it pulled me hard to the passenger side. I figured it was a caliper so I replaced it, bled the lines and everything. The issue still continues though, it's still pulling to the passenger side. I'm thinking it may be a collapsed line now. I've heard somewhere that the rubber hose may collapse sometimes. Could that be a possibility? I pulled the tire off the other day and you can feel there is a harder spot when turning the hub. It spins freely and then slows down. Could it be the rubber brake line or an issue with the hub itself? Like I said,it didn't do this until I had to slam on the brakes. I didn't see any leaks from the hub seals or anything like that. I have to get this fixed asap due to my firewood business. I don't want the brakes to go out on me while hauling a load of logs with the trailer. I just got the truck a few months ago so I'm trying to get it fixed up, it's not a looker but it's got potential with only 192k miles. Any help would be appreciated.