ineverfollow

Rotated tires the other day and put them back on and tightnened them down, went to a car show and the next night i started to hear a funny clanking noise from the back brakes??? It only does it in foward gears and not in reverse!! While cleaning my car for the car show i sprayed some brake cleaner in them to clean them off and get rid of the winter crud for the summer, but i dont think this would have an effect on them??? If anyone with some insight on what is going on with them could fill me in id appreciate it and also maybe point me in the right direction of a solution for the problem!!!

thanks for your help