I'm gonna attempt to change my front rotors and pads for the first time tomorrow. As of right now when I roll slow(5-15mph) I get this kind of clanking noises, but it's not when I put on the brakes it's only when I roll. The sound is like a metal sound, not a clunk like a bad axle,even though my right one is bad.
What should I be looking for when I go at it tomorrow? What could the clanking be? My brakes are worn preety badly so could this be something dragging on the rotor? I don't really think it is a frozen caliper but if I do have a frozen caliper what are the visual signs if any?

I assume it has something to do with the brakes could it be anything else?