Funny you mention this. I've been through a brush-style car wash numerous times and never once thought about disabling the radar features. Also, none of the brushes trigger any warnings to the safety systems. Thinking about it now, I'm actually kind of surprised.My car wash has instructions at the start to turn off collision avoidance systems so I always turn off the front and rear ones just to be sure, not sure if it would actually set them off or not but don’t want to find out.