The contact owns a 2024 Ford Mustang. The contact stated that while his wife was driving at 25 MPH and entering a roundabout, a vehicle suddenly entered the roundabout and was rear-ended. The brake pedal was depressed however there was not enough distance to avoid the collision. The forward collision warning (FCW) system did not engage. No air bags deployed. The vehicle was towed to an independent mechanic but was not diagnosed or repaired. No injuries were sustained. A police report was filed. The manufacturer was not notified of the failure. The approximate failure mileage was 6,100.