by 
The Curious Bag
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<h4 class="dechead">On One Hand: Different Feel
Rotors will give warning signs when they need replacement. Among the symptoms are a rough feeling when the brake pedal is pressed and scores that can be felt on the surface of the rotors.
On the Other: Brake Relation
Brake pads usually need to be changed every 30,000 miles, and the brake rotor will last through two to three pad changes before it, too, needs to be replaced. In other words, the rotors will need to be changed every 60,000 to 90,000 miles.
Bottom Line
There is no formula that determines how often rotors need to be replaced because driving conditions--freeway driving versus city driving, for example--and the driver's habits can affect how long they last. When you notice that braking isn't smooth anymore, that's the time to replace the rotors.
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