How do I stop my front disk brake from sicking on my dirt bike? When I tap on the brake (caliper) it releases but it won't release all the way by itself.....

 

either your disk is warped, or your caliper piston is hanging up in the bore and needs to be taken apart and cleaned with fine emery paper and a new piston seal put in. make sure to wash it out thoroughly to remover all grit if you do this yourself.