My vehicle vibrates when braking! Help!

Ever wondered what is happening when your car vibrates when you hit the brakes?  When you operate your brakes it creates an immense amount of heat in the brake rotor.  This heat can cause the metal to warp especially after hitting a puddle with some cold water in it after the brakes are already hot.  When the metal warps it can cause uneven contact between the brake pad and the brake rotor.  This is felt  in the steering wheel if it is your front brakes and the body of the vehicle if it is your rear brakes only when the brakes are applied.