While driving threw a construction zone the car upfront of me stopped. Upon applying the brakes nothing happened. There was a tractor trailer beside us and I was at the reR and another car was at the front plenty of time to stop. Brakes didn't activate until right before impact and the nose dove down. ABS never activated and the collision avoidance never activated. I was traveling with my wife and two young kids lucky no one was hurt and I had no avenue of escape due to cement barriers and 18 wheeler.