So i have some faint pulsing from the front brakes. Mechanic says it's a warped rotor, though he didn't put a gauge on it. I assume you just replace both, especially if you are not going OEM. I'm looking at ~$500 for the rotors and new brake pads (seems silly to me to not replace the pads whle you are doing this). So questions. After market rotors or OEM ? Replace both even if only one is warped? I do need to verify that the rotor is indeed warped, but I had a piston that was sticking intermittently, very slightly, and i bet it heated up the rotor and did it in. but will want to check to be sure.