l33ks

So today I was just driving along normally and was slowing to an easy stop with the brake pedal depressed lightly when suddenly the brakes seemed to grab really hard for a split second. It felt as if I had stomped on the brake for a millisecond even giving me and the car a jerk..but it was only for a split second then it continued to brake normally. This happened at around 20-25 mph. Anyone have any idea what happened/caused this? It's the first time I've experienced it and it worries me a bit.
2016 is350 Fsport..16xx miles