rear brake caliper rattle or clatter

[krasmu]

I replaced the pads on my rear brakes a while back and ever since I have a small rattle or clatter coming from them when I brake. They are quiet when not braking but they make this noise only when braking. They work fine but I feel something is loose in the system and want to get it right but I'm not real sure what to look for. I'd think most anything that would rattle would go away when braking force is applied. For the longest time I thought I had static coming from the rear speaker because I did some stereo stuff at the same time. It reminds me of, if you spin a bearing that is missing a ball or two or like the rear derailer on a bike when you coast.