know how often should I change my brakes and disck and how much does it cost on 2008 Lexus RX350

My car has been run for almost 40,000 klm now , the dealer told I have to change the both brake and disck,that costs me around $600,but I think the brakes are fine,those people behind me, so I want to know how often should I change my brakes and disck and how much does it cost

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1 answer
most unusual to need rotors at 40,000 miles. i think that
i would get a second opinion from a good local shop that specializes in Japanese cars.