There is no mileage rating on brake pads. It is all up to the driving conditions. If you do a lot of highway driving and never have to go through stop and go traffic, then I have seen pads last over 100,000 miles. If you do a lot of stop and go driving, then they can burn up in as little as 15,000 miles. It also depends how you brake. Do you wait to the last second and then brake hard or do you progressivly stop. A lot of people also have a bad habit of driving with their foot on the brake pedal which will also wear them out quickly.