Okay, I know that seems odd, but lately, when I apply the front brake, I get an initial sound like a Darth Vader exhale (only quieter). It's almost a rubbing sound, but not quite. Thinking that maybe I was down on the pad wearline, I pulled the calipers and checked - there's plenty of pad left. So I cleaned the pads with rubbing alcohol and also wiped down the rotors. It's better than it was, but there's still a Vader-link hint. Nothing else seems to be rubbing anything, anywhere (I double-checked the usable range on my rear brake, and it's fine as well). Any ideas? Aside from calling in Luke Skywalker to remove the problem?