by 
The Curious Bag
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<h4 class="dechead">On One Hand: Knowing Your Rotors Are Brand New
Many people simply replace their rotors every time their vehicle needs brake pads. This is because it is not too expensive and it provides piece of mind that your rotors will not wear out unexpectedly (rotors do not have sensors indicating the need for replacement like brake pads do).
On the Other: Getting the Most Out of Your Rotors
Rather than replacing your rotors outright, you can resurface them by machining or "turning" them. Most repair shops and auto parts stores can do this. During this process the surface of the rotor is made smooth by shaving the surface layers off. Rotors have a minimum thickness requirement for safe operation. Most rotors can be machined at least once.
Bottom Line
It all depends what you are comfortable with. If the additional cost of new rotors does not bother you, buy new rotors. However, if you do not want to pay for something you do not need, machining your rotors is a cost-effective and safe way to extend the life of your rotors.
Source:
Raybestos Brakes: Brake Rotor Safety Public Awareness Message
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