Dolemike

Ok, during a nice cheerful run on the Dragon during the meet I noticed a clunking noise coming from the rear of the car. After letting the car cool down I noticed it wasnt making the sound as consistent. Now it appears to only make it during braking at under 30mph, never during acceleration. At first I thought it was coming from the rear drivers side but today it seemed to be in the middle rear or on the left side. The sound is rhythmetical (if thats such a word) and stops when the car stops. I have noticed that my rotors are probably warped as I get the shimmy when slowing down. Would it be suspension or something to do with the brakes?