Does anyone know if the brake light comes on when Lane Keep Assist is triggered?
I assume it does because when the feature is triggered the brake is applied to coax the vehicle back into its lane, but the manual doesn’t mention it one way or the other.

15K on the clock now and still learning.

Yes!

I could not wait soon enough to have that feature turned off. The 1st time I drifted out of my lane a bit it grabbed a steering wheel out of my hand and applied the brakes aggressively. Scared the hell out of me.

I've been wondering about this brake light question too, ever since I got my 2020 SL550 last September.

I'm torn regarding the lane keep assist feature. On the one hand, it could be an important safety measure. On the other, it seems too aggressive. I like to drive close to the right edge of the slow lane and close to the left edge of the fast lane. The Benz will stridently resist these efforts a little sooner than necessary--which startles me every time. Even with the "adaptive" setting turned on, which I believe is intended to adjust for such driver preferences, it still seems to be an over-correction.

For now, I still have it turned on.

Rick F.

Perhaps you need to have it checked.....mine is nothing like that. Maybe you were more surprised than anything else. The car brakes to correct the drift but nothing like what you describe.

Seems you have diagnosed the issue yourself.....

Why not drive in the middle of the lane as we should do, give yourself more room to manoeuvre and not have issues with the lane keeping system?

The edges of the road is where all the rubbish ends up and on our terrible roads, where most of the potholes are.