The adaptive cruise control as well as regular cruise control limits the electronic braking to 10 kW. After that the friction brakes take over. There is little indication of it, and I think it’s a safety risk because in hilly areas, as well as mountainous roads, the friction brakes activate risking overheating the brakes and a brake failure. I believe the earlier model years would not limit the electronic braking and would maintain the speed down hills using regenerative braking exclusively.