Breaks problem|BMW X5

Hi, I own a 2011 BMW X5, and I'm having a problem with the breaks, when i push the pedal down to stop, I feel kind of a drop of the pedal....does someone came across that kind of problem???

Thank you for your help

Sounds like a bad master cylinder to me. Warranty time.

Since double posting is a no-no, lets see how this plays out in the other section.