2023 MAZDA CX-9 Forward Collision Avoidance Automatic Emergency Braking Problems

I was approaching Breezewood, Pa coming south on 70 into town from Hagerstown. Traffic comes to a stop awaiting a light that stops the highway traffic before allowing people to proceed through Breezewood and then continue on 70 out of town. I had plenty of warning as traffic slows first from 55 to 45, then to 35 before the light. As I applied pressure to the brakes the vehicle would not slow down. I released them once and reapplied and it felt as if they were doing nothing to slow me down. There were a lot of cars ahead of me and around me and the car did hold its lane thank goodness, but I ended up colliding with a stopped pickup/trailer (Ram with a car carrier/flatbed trailer). None of the vehicles collision avoidance warnings or safety features seemed to assist in the warning of the impending collision or deployed...