Abs Brake Fail problems of the 2014 Chevrolet Volt

Incident occurred while coming to a stop at a traffic signal on city streets. Reached approximately 5 mph as I approached he intersection, when brake pedal went to floor, and normal braking failed. Pressing the pedal as hard as I could, was able to get car to a stop in 2 car lengths, but overran the limit line. Luckily there were no pedestrians or other vehicles in front of me. No injuries or property damage. Car was towed to dealership for diagnostics. Car reported "leaking brake circuit" via remote manufacturer diagnostics. Internal displays indicate "brake assist failure", "abs failure" and "stabilitrak service required".