Steve'sA6

Do the brake lights come on when the system brakes the vehicle? I was in stop and go traffic today and it seemed like the person behind me wasn't slowing down or stopping as quickly as I would have expected when I slowed down or stopped.

jr'sAudiA6

As far as know yes the break lights come when the cruise control is breaking.

fvike

It does. I've seen reflection of my own lights on cars behind me. However, I did notice several Mercedes-Benz E-classes on the Autobahn that didn't signal braking with the brakelights. Scary at those speeds.