My rear brake is really pulsating and my front is pulsating and squeaking. This is very noticeable at slow speed like pulling up at the lights. I have been doing a few emergency stops lately and was wondering have I overheated my disks and caused them to warp? I hope not because it will be so expensive and hard to replace... Or could it be the pads are gone and are causing this? What about the brake fluid could it be old and need changing? Bike is a 93 FZR250 has dual front disks and a single rear disk brake.