Whelp...it seems like I've warped my brake rotors. When I press hard on the brakes I've got a good shaking and some weird noises going on. Guess standing on the brakes from time to time has taken it's toll. Not sure if there are any other easy tests I can do to make sure my hypothesis is correct.
So should I just replace the rotors? Have them resurfaced? Or just bite the bullet and get the AP sprint BBK?