[E90bedi]

I went in to give my e90 for servicing and they gave me a f30 328i with just 47 miles as a loaner. i was driving down a hill and naturally i started braking for the stop sign. and i realized that the car wasn't slowing down. i tried to pump the brakes. and that did not help that much. i put the car in manual and tried down shifting but that didnt help much. the car gradually picked up speed from 25 mph to 45. and my last resort was the handbrake. i pulled it as hard as a could and tried to slide the car to prepare for impact that way it wouldnt injure me as much. the car is totaled. Has anyone else experience something like this? I am very surprised to see that on a brand new f30 the brakes would act like this. Any comments would be appreciated thanks!