Front disk brake(s) sticking- where to start toubleshooting?

If the "hang" can be felt through the pedal, I suspect the problem is between the pedal and the master cylinder. I can't feel hanging problems through the pedal is the issue is at the caliper.

My usual experience is for a single, sliding caliper to hang. This happens when the pins or the ways that the caliper uses to slide are not straight and smooth. I've never had a piston seize in a caliper, but I know it can happen. When something of this nature happens at the caliper, pad wear is uneven between the sides and sometimes even the pad itself develops a significant "ramp".