Rear brake making "clunking" noise
Occasionally, when braking I hear a "clunking" noise from the rear break. Not only can I hear it, but I can feel it in the brake lever. I have inspected the brake several times and everything seems to be fine. Nothing is loose; all the bolts and pins are in place and tight. The brake pads have plenty of material on them, are positioned correctly and are not loose. The rotors are smooth and there are no hard spots that I can tell. The bike has 8000 miles on it. It doesn't happen every time I brake, just occasionally. But when it does happen, it's pretty loud. It does not seem to affect the braking, though, which is good.
Any thoughts as to what it might be? Anyone else ever experience this?