so most of you will remember my thread from earlier this week. Basically, One of my front pads (inner one the one by the piston) was worn all the way down. So the common theory is that I have a stuck caliper. maybe. Otherwise it just needs to be cleaned really well. So my question is, once I take out the pads, how do I tell beyond a doubt if my caliper actually needs to be replaced rather than just cleaned really well?