Both my front and rear brakes are stock. The previous owner rebuilt both calipers. Both brakes work very well but...At slow speeds I notice a metallic tink, tink, tink at slow speeds when the brake IS NOT activated. I examined the calipers and found that I can touch the under side and move my finger back and forth and produce the rattle. It feels like there are two tabs in sockets that have all this front to back clearance that are making the noise. Both calipers do the exact same thing and make the same noise. I believe that these are the tabs of the two friction pads that are floating in these oversized sockets. Now...the qiestion. Is this supposed to be happening? Is that noise part of the operational symphony of noises that go with these bikes?