I beleive in my experience that brakes develop a pulsation based on a non-flat braking surface, I call it warped you can call it whatever you like. This is caused by a few different things, heat, mis-torqued lug nuts, and junk chinese rotors that can't take the abuse of normal braking. It is also my experiance that replacing rotors and pads to fix a severe pulsation is the best because severe pulsations normaly return to a turned rotor. Lesser pulsations can be fixed by turning the rotor and scuffing or replacing the pads. Regardless the cause I don't see how the fix would be any different. This is the way I do brakes and along with making sure the hub is cleaned and things work the way they should, my customers are happy.