Yesterday my brakes were making a ton of noise whenever I was using them. It wasn't just a normal squeak, it was a really loud high pitched noise whenever I touched the brakes that didn't go away until I released the brakes. What's the problem? When I got home I cleaned my rotos and calipers and wasn't sure how to check for anything else. I've never done a brake job before, and I'm wondering if this is the cause of a frozen caliper or worn down pads or what? The car won't be driven again till Monday but if I have time what should I check for?