i recently took a trip through our local carbon canyon (double hairpin turns and what not... fun stuff). anyway... i was driving along and i hear kinda a scraping noise coming from my rear right brake... as if the pad is just barely touching the disc. sometimes it goes away when i press on the brake pedal a lil... sometimes it won't go away at all till i drive for a bit. It kinda feels like maybe the brakes aren't squeezing back there sometimes and the pads just sit there shifting around... touching the disc on occasion. Sometimes it seems as though they're working... i dunno. any ideas guys?