While disc brakes tend to last anywhere from 30,000 to 50,000 miles, the length of time brake rotors typically last depends on several different factors. These factors include how often the brakes are applied, how hard they are applied, the weight of the vehicle and how often the brakes have been serviced.
It is important to perform regular maintenance to increase the life span of brake rotors. Check brake fluid frequently. Change the brake fluid periodically. Inspect the brake pads regularly, and change them when you can no longer see much of the pad. Periodically inspect the rotors for wear. Replace the rotors when there are signs of wear or cracks.