Well I have posted in the past about a squealing problem I was having on the passenger rear area. I suspected the rear caliper was sticking so I took everything apart and lubed everything up and that worked for abouta whole 2-3 days if that. So it wasnt squealing as bad but still did it intermitently. So the other day I heard a metal on metal sound and went away when I hit the brakes pretty hard, so I decided today to go buy a new caliper and replace it...BINGO! went to advanced auto and bought a new one, $53 with core exchange and it was replaced 30 mins later. Took it for a test drive and its fixed!