I was looking at a set of Hard drive magnents my dad has, if you have ever looked at them, you will note they look like disc brake pads and are very strong. My dad said they used electromagnets as brakes on machines for stops for a soap factory he worked for. Would it be possible to harness the electromagnetics for vehicle brakes, use a regular rotor but a special non moving caliper, that has electromagnetic transfer type pads ( or transfers magnatism onto the rotor ) keep the rotor to brake pad clearence to only a couple thousandths, then use a variable resistor to control voltage to the magnents and control the braking power. this sound feasable.