Since winter when I back up I sometimes heard a like a rub noise when I backed up, I assumed my e-brake was sticking due to the really cold weather up here cause it sounds like I'm backing up with the e-brake on. It's started again and is now extremely loud and will not cease, it occurs on almost every back up. I just got new tires today and on my rear drivers side LCA the nut that holds in the strut has broken off, I have 2 new control arms on the way cause I'm in the middle of my suspension but I didn't break the bolt. Any input if this could be causing the noise and also if not what could

 

maybe your mounts?