Originally Posted by DodgeRam96

I'm almost certain that you didn't blow the hard line which runs from the master cylinder to the rear of the truck. There's a rubber hose line which connects to the hard line just rear of the tank. There's a bracket mounted to the inside of the C-Channel which hold the two connections together. The rubber hose line then connects to a junction block on the rear end which sends fluid to the left and right wheel cylinders. It's probably what let go not the hard line. You're supposed to inspect these because they get old and brittle, not to mention that brake fluid is higly corrosive and that it's a difficult place to access. Drop the spare tire stuff your head under and replace all your lines with a braided set.