Wondering if anyone has any suggestions about a rear rotor problem. When cornering hard, it will start squeeling like a banshee, No brakes applied. It does it even when I switch bikes (one avid, the other hayes). The only thing I can assume is that there is something on it, but it looks clean and I have repeatedly cleaned it with alcohol. I have checked the bolts multiple times as well and I can't find anything loose. Its about 2 years old and has been ridden hard, but I cant find anything wrong with it.