Why does my Audi A5 shake while braking?

I have noticed that my Audi A5 shakes and vibrates when I apply the brakes. This only happens at higher speeds and the car seems to be fine when driving at lower speeds. Is this a common issue or something I should be concerned about?

This can be a sign of warped brake rotors, which can be caused by excessive wear or overheating. It is best to have the rotors checked by a mechanic to avoid further damage to your car.