So for the life of me I cannot figure this one out. I have a squeak coming from the rear of my JKU and I originally was coming from the rear left seat (I fixed this by smacking on the back of the headrest a couple times). Now the squeak is back and it's not coming from the seat. It only happens when I hit bumps, or shut any of the rear doors including the tailgate. I've done some searching and it seems that popular consensus seems to believe its the brake lines rubbing on the suspension, however, It does not make the sound on compression, only on rebound, so I'm not sure if that would be the cause. I've been banging on everything in the back and can't seem to replicate it, unless i shut a door. Any thoughts would be much appreciated.