When I tested a Q7 two years ago before buying mine, it was equipped with such system. Sure enough on the test drive it went off 2-3 times, scared me off, every time bracing preparing to get rear ended. Sure enough I didn't order it on mine, it just have a warning signal now, no braking on the Q7.
When I ordered the Cali I thought I get a better system : 17" brakes, keep adequate distance from vehicle in front, eyes on the road, no use of Smartphone unless via AppConnect to answer calls. No posting on the forum, facebook, whatsapp, while at the wheel.