Disc Brake info!

Also what do you mean by have rotors turned?

You take them to someone who "turns" them on a brake lathe to true them up. I actually own one of these, and in a "previous life" have turned thousands of drums and rotors

[ame="http://www.youtube.com/watch?v=wUh5NPNb9VQ"]Brake Lathes - AMMCO 4000E Brake Lathe Rotor Reconditioning - YouTube[/ame]