ughh, i only said it cause u guys said it...but apparently it wasnt any of that...what it was, was that i was missing a bolt that holds my caliber to the rotor and another was really loose...so, when i reversed and stop, the caliber would cling onto my wheel and hault that bitch....i noticed after looking at my hweels got all tore up...so problem solved guys...but one more question for all u knowledgable ones.... why is it that when i push my clutch pedal in, it makes a woosh sound???