I just put new pads in and basically felt my rotor to see if there were and bad spots. Pedal wasn't pulsing before and isn't after. I did a few run-ups to 50 or so, firm but not lock-up braking runs and all seems to be OK. I suspect one can change the pads a couple of times before changing the rotors and in the scheme of life, the MB rotors aren't all that expensive.