If you are driving your BMW on rocky and rough roads, then it's very common that its brake pedal or the steering wheel is vibrate during braking. But, the car shakes on normal roads while braking causing numerous serious problems which need immediate attention of a mechanic. Go through the video to know about the reasons behind your BMW X5 shakes when braking.
https://www.youtube.com/watch?v=LpYCj44nNcI