The Automatic Emergency Braking System failed me today. The truck is available for inspection. I was driving at about 45 mph, when a car pulled out from a driveway infront of me when it probably should have waited, but there was still time for me to brake safely. I started to apply the brakes and the truck slammed on the brakes, no red lights on the dash flashing, no warning beep. I pulled my foot off the brake because I wasn't sure what was happening but, the truck slammed the brakes to a full STOP.. instant stop! If there had been a car behind me, I would most certainly have been rear ended. The seat belt locked up, my body was thrashed forward twice because of the quick slow down and the stop. I'm sore, scared and not sure what to do. This isn't something that can be recreated without putting someone else in danger. This is not a safety feature, it's an accident waiting to happen!