The rear brake hose clips onto a bracket on the body. That's the end attached to the long rigid brake line that runs to the front of the car. The other end of the brake hose is a brass block. The brass block is a tee that sends brake fluid to the wheel cylinders. In the center of the brass block is a large thru hole used to mount the block to the rear axle tube. Rather than use a bolt, Mopar used the rear axle vent. Two birds with one stone.
