While driving on a residential street the VW Front Assist suddenly engaged the brakes. There was no car in front or any cars driving in the area. The car came to a complete stop. The only explanation may be that it had been recently raining in Seattle and it was also late in the day so the sun was low in the sky. There was also a metal plate on the street that appeared to be reflective with the rain. We have had incidents like this in the past while driving over the University Bridge as well which is a metal grated draw bridge in Seattle. We are extremely concerned that the brakes will engage and we will be rear ended. I had the dealership inspect the Front Assist feature on Thursday April 17th, 2025 and they have no indication of any fault with the system. The radar sensor that the feature relies upon was properly aligned and in working order. This system makes our car less safe to drive than if it was permanently disabled. Rain followed by sunshine is common in Seattle creating situations where the Front Assist will be triggered incorrectly putting us and other motorists at risk.