I have a right front brake that periodically sticks on my Sportsman 500....any advice? It seems to clear itself when I hit a small bump. Is there a cylinder in the right front brake assembly that could be sticking and how can I clear this problem without spending more big bucks?  

is it a disk brake set up?
if so you'll need to remove the caliper, remove the brake pads and carefully using a pair of channel lock pliers and a rag wrapped around the caliper piston remove it.

clean the round surface of the caliper piston with very fine sandpaper or a brass brush making sure not to damage it. then carefully clean the walls of the hole inside the caliper that the piston came out of.

you want it to be smooth and free of any dirt,rust, or grime.

if it is a drum brake system
dissassemble the drum brake and remove the lever that the brake cable runs through, then remove the rod that the lever bolts onto.
it should slide out fairly easily. clean the rod with some fine sandpaper, remove any and all brake dust. then clean the hole it came out of.

it should turn freely without the brake shoes on.
clean out the drum and clean the brake shoe springs. but don't get any cleanser or degreaser of any kind on the brake shoes. as they will crystalize causing them to work poorly.