Join Date: Sep 2008
Location: southern Minnesota
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Sometimes the rotors will develop a warp from getting hot, then cooling or water from puddles, etc so when you put new pads in, they will give you a pulsating pedal when you hit the brakes. Not a problem or affect the working of the brakes, but it can be a bit annoying. That is why they 'turn the rotors' or take a layer off them, and to eliminate any hard spots on the rotors. Most of the time they are fine when you replace the pads (unless they are worn and grinding or squealing) The price on replacement rotors is very close to the price of having them 'turned' and if they are resurfaced below the min thickness, they would need to be replaced anyhow.
Just as easy to replace them. If you are doing them yourself and want to just replace the pads, I'd go for it. Ceramic pads will tend to do some resurfacing themselves so next time you put new pads in, they may be below the limit I usually replace rotors every other brake replacement.
Hope that helps.