Last year I had my rear brake pads changed. Ever since then I would get some really annoying clanking going on as I would go over bumps. I could only hear it with the windows down or top off. It finally bugged me enough the track it down. I figured out it was coming from the brake calipers. A little research and figure out that it could be the anti-rattle clips on the calipers. Picked up a brake hardware kit at my local auto parts store and replaced the clips. NO MORE RACKET!!! Such an easy fix. Just thought I'd share in case anyone was having the same problem.