Distance warning function
Autonomous braking function
Situation-dependent braking assistance
Vehicles with Driving Assistance Package: Evasive Steering Assist and cornering function
Active Brake Assist can help you to minimise the risk of a collision with vehicles, cyclists or pedestrians, or reduce the effects of such a collision.
If Active Brake Assist has detected a risk of collision, a warning tone sounds and the 
distance warning lamp lights up in the instrument cluster.
Vehicles with PRE-SAFE®: depending on the country, an additional haptic warning occurs in the form of slight, repeated tensioning of the seat belt.
If you do not react to the warning, autonomous braking can be initiated in critical situations.
In especially critical situations, Active Brake Assist can initiate autonomous braking directly. In this case, the warning lamp and warning tone occur simultaneously with the braking application.
If you apply the brake yourself in a critical situation or apply the brake during autonomous braking, situation-dependent braking assistance occurs. The brake pressure increases up to maximum full-stop braking if necessary.
If autonomous braking or situation-dependent braking assistance has occurred, display 
appears in the multifunction display and then automatically goes out after a short time.
If the autonomous braking function or the situation-dependent braking assistance is triggered, additional preventive measures for occupant protection (PRE-SAFE®) may also be initiated.
Active Brake Assist cannot always clearly identify objects and complex traffic situations.
Give a warning or brake without reason
Not give a warning or not brake
If the system is unavailable, the 
display appears in the multifunction display.
Also observe the system limits of Active Brake Assist.
From approximately 30 km/h, if over several seconds the distance maintained to the vehicle travelling in front is too small for the driven speed, the
distance warning lamp lights up in the instrument cluster. From approximately 7 km/h, if your vehicle is critically close to a vehicle or pedestrian, you will hear an intermittent warning tone and the
distance warning lamp lights up in the instrument cluster. Vehicles with PRE-SAFE®: depending on the country, an additional haptic warning occurs in the form of slight, repeated tensioning of the seat belt.
Brake immediately or take evasive action, provided it is safe to do so and the traffic situation allows this.
Speeds up to approximately 250 km/h when approaching vehicles ahead.
Speeds up to approximately 80 km/h when approaching stationary vehicles, moving pedestrians and cyclists ahead.
Speeds up to approximately 60 km/h when approaching cyclists.
Speeds up to approximately 250 km/h when approaching vehicles ahead.
Speeds up to approximately 100 km/h when approaching stationary vehicles.
Speeds up to approximately 80 km/h when approaching moving pedestrians and cyclists ahead.
Speeds up to approximately 70 km/h when approaching crossing vehicles, stationary pedestrians as well as stationary and crossing cyclists.
Speeds up to approximately 200 km/h when approaching vehicles ahead.
Speeds up to approximately 80 km/h when approaching cyclists ahead.
Speeds up to approximately 60 km/h when approaching moving pedestrians and crossing cyclists.
Speeds up to approximately 50 km/h when approaching stationary vehicles.
Speeds up to approximately 250 km/h when approaching vehicles ahead.
Speeds up to approximately 100 km/h when approaching stationary vehicles.
Speeds up to approximately 80 km/h when approaching cyclists ahead.
Speeds up to approximately 70 km/h when approaching pedestrians who are standing still or moving, crossing vehicles as well as stationary or crossing cyclists.
Speeds up to approximately 250 km/h when approaching vehicles ahead.
Speeds up to approximately 80 km/h when approaching stationary vehicles and cyclists ahead.
Speeds up to approximately 60 km/h when approaching moving pedestrians and crossing cyclists.
Speeds up to approximately 250 km/h when approaching vehicles ahead.
Speeds up to approximately 100 km/h when approaching stationary vehicles.
Speeds up to approximately 80 km/h when approaching cyclists ahead.
Speeds up to approximately 70 km/h when approaching pedestrians who are standing still or moving, crossing vehicles as well as stationary or crossing cyclists.
Fully depressing the accelerator pedal or with kickdown.
Releasing the brake pedal.
You manoeuvre to avoid the obstacle.
There is no longer a risk of collision.
An obstacle is no longer detected in front of your vehicle.
You can watch an animation on this topic at the following link:
The ability to detect stationary or moving pedestrians.
Assistance through power-assisted steering if it detects a swerving manoeuvre.
Activation by an abrupt steering movement during a swerving manoeuvre.
Assistance during swerving and straightening of the vehicle.
Reaction from a speed of approximately 20 km/h up to a speed of approximately 70 km/h.
You can prevent the assistance at any time by actively steering.
If a danger of collision from an oncoming vehicle is detected when turning across an oncoming lane, autonomous braking can be initiated at speeds below 15 km/h before you have left the lane in which you are driving.
Evasive Steering Assist cannot always clearly identify objects and complex traffic situations.
In addition, the steering support of Evasive Steering Assist is generally not sufficient to avoid a collision.
give an unnecessary warning or provide assistance
not give a warning or not provide assistance
You can watch an animation on this topic at the following link:
Full system performance is not available for a few seconds after switching on the ignition or after driving off.
In snow, rain, fog, heavy spray, if there is glare, in direct sunlight or in greatly varying light conditions.
If the sensors are dirty, misted up, damaged or covered.
If the sensors are impaired due to interference from other radar sources, e.g. strong radar reflections in multi-storey car parks.
If a loss of tyre pressure or a defective tyre has been detected and displayed.
If DSR is activated.
In complex traffic situations where objects cannot always be clearly identified.
If pedestrians or vehicles move quickly into the sensor detection range.
If pedestrians are hidden by other objects.
If the typical outline of a pedestrian cannot be distinguished from the background.
If a pedestrian is not detected as such, e.g. due to special clothing or other objects.
On bends with a tight radius.
The Active Brake Assist sensors adjust automatically while a certain distance is being driven after the vehicle has been delivered. Active Brake Assist is unavailable or only partially available during this teach-in period.