So rotors, depending on the condition, can be turned. Turning meaning they put them on a lathe and make them flat again by shaving off a certain amount of surface.
A rotor can only be turned so many times in spec. You can take your rotors, once off the car, to most parts stores and they will turn them for you. But they will ONLY turn them, if they are thick enough to stay in spec.
It is a good idea to have rotors turned. Often, I won't even do that. If you pull the tire off, feel the rotor's surface (running your finger over it). If it's flat and smooth (no bumps) then I will just throw a new set of pads on and call it good. If it feels like a mountain range, then you need new rotors or have them turned. The only thing you can't really feel for at that point, is if the rotor is warped.
Obviously, if you can't get them turned, then you need to get new rotors.
A rotor can only be turned so many times in spec. You can take your rotors, once off the car, to most parts stores and they will turn them for you. But they will ONLY turn them, if they are thick enough to stay in spec.
It is a good idea to have rotors turned. Often, I won't even do that. If you pull the tire off, feel the rotor's surface (running your finger over it). If it's flat and smooth (no bumps) then I will just throw a new set of pads on and call it good. If it feels like a mountain range, then you need new rotors or have them turned. The only thing you can't really feel for at that point, is if the rotor is warped.
Obviously, if you can't get them turned, then you need to get new rotors.