I just got my Z4 back from having the dragging belly pan repaired ($240!!). I was told that I needed brakes. OK, I'm at 45K, I've had the front pads replaced under warranty but I am not experiencing any problems such as a pulsing pedal or steering wheel shimmy while braking. The estimate was $950. It seems high if I just need pads. Does BMW recommend rotor replacement too at my mileage? I thank you for your input in advance.