The brake application function is only available for vehicles with a Driving Assistance Package.
If Active Blind Spot Assist detects a risk of a side impact in the monitoring range, a course-correcting brake application is carried out. This is designed to help you avoid a collision.
The course-correcting brake application is available in the speed range between approximately 30 km/h and 200 km/h.
A course-correcting brake application cannot always prevent a collision.
if vehicles overtake too closely on the side, placing them in the blind spot area
vehicles approaching and overtaking you at a greatly different speed
As a result, Active Blind Spot Assist may neither give warnings nor intervene in such situations.
If a course-correcting brake application occurs, the red warning lamp flashes in the outside mirror and a warning tone sounds. In addition, a display 
indicating the danger of a side collision appears in the multifunction display.
In rare cases, the system may make an inappropriate brake application. This brake application may be interrupted at any time if you steer slightly in the opposite direction or accelerate.
Vehicles or obstacles, e.g. crash barriers, are located on both sides of your vehicle.
A vehicle approaches too closely on the side.
You have adopted a sporty driving style with high cornering speeds.
You brake or accelerate significantly.
A driving safety system intervenes, e.g. ESP® or Active Brake Assist.
ESP® is deactivated.
A loss of tyre pressure or a defective tyre is detected.
You are driving with a trailer and the electrical connection to the trailer hitch has been correctly established.