Generally, warped, grooved rotors are to blame for a thumping sound or shaky sensation. There are many reasons why brake rotors can become uneven. Like any other auto element, brake rotors deteriorate with use. Your braking and steering may not feel smooth because your brake pads will rub against a surface. Typically, brake rotors need to be replaced every 15,000 to 70,000 miles. However, the precise amount is determined by your driving habits, brake pads, and vehicle.