06 450 kodiak bought the bike used went out for a ride , after 5 km gf passed me and noticed her rear brake was on fire , put it out cooled everything of with water . replaced the caliper seals pads lubed parts put it back together went for a test drive seemed to release good , headed up the mtn stopped at 5km was smoking almost ready to burn , hose blew, pressure released no brakes on rear . any ideas why it is holding and heating????