Originally Posted by kgroschi
I know that hot brakes squeak. I go to the track a couple times a year. But this sounds like a ceramic brake squeak if you ask me. I am pretty confident that this will be an option for the new M3. (Or maybe as a performance part)
If you can identify brake rotor material from the sound spectrum of brake squeal then hats of to you (no pun intended). I'd be willing to bet though that in a true blind test you would bat just about precisely .500 in making the call on the material. One reason for my belief is that brake squeal is more of a function of the pad as than the rotor, cast iron or carbon ceramic.