I remember reading in another thread awhile ago that Brembo actually made OEM BMW Calipers but I couldn't confirm it via google search. So armed with a camera, I decided to poke around the back of the caliper and lo and behold, Brembo is stamped on the back of the front caliper.
I thought I could contribute to the online world who are searching "Are BMW X5M caliper made by Brembo?".....Yes.....yes they are.
I wonder why BMW decided to leave Brembo logo off the front of the caliper? Seems like a good selling point to me.
Here are the pics to prove:
Back of caliper:
Front of caliper: