While turning into a driveway at low speed (approximately 5 mph), I attempted to brake, but the brakes did not respond properly. The vehicle began to bump and resist braking, and failed to stop when expected, causing me to hit a fence. This model is equipped with automatic braking and collision avoidance systems that should have activated, but they failed to engage. This was a concerning failure for a brand-new vehicle equipped with advanced safety systems. Hyundai has not provided any clear answers or support. This appears to be a malfunction in the braking or electronic safety systems, and I believe it poses a serious risk to other drivers and pedestrians