Guys,
Can't seem to tell you how happy I'm not alone with this problem. My 05 TBA just started the "clunking" and I was thinking of bringing it in. Rear brake seems to work fine, however, I get that clunking during "hard" rear braking. Maybe it was there all along and I didn't really notice it as it doesn't seem to happen under normal stopping or I never noticed it (also I have to deal with traffic noise and a helmet). As always thanks for the rubber suggestion. I'll let you know how I make out.