Distance warning function
Collision warning
Autonomous braking function
Situation-dependent braking assistance
Evasive Steering Assist (country-specific)
Active Brake Assist can help you to minimise the risk of a collision with vehicles, cyclists or pedestrians or to 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 Assistance menu, an insufficient distance to the vehicle in front is displayed in red. If you further reduce the distance, the vehicle in front is also highlighted in red. When the system detects a risk of collision, red radar waves appear in front of the vehicle.
Vehicles with PRE-SAFE®: depending on the country, an additional haptic warning occurs in the form of slight, repeated tensioning of the seat belt.
Vehicles with active ambient lighting: if Warning assistance is activated, the Active Brake Assist warning is also accompanied by ambient lighting More.
If you do not react to the warning, autonomous braking can be initiated in critical situations.
In particularly critical situations, Active Brake Assist can also 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, pop up appears in the driver's 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
Active Brake Assist is only an aid. The driver is responsible for maintaining a sufficiently safe distance to the vehicle in front, vehicle speed and for braking in good time.
The individual subfunctions are available in the following speed ranges:
You are warned by the distance warning function from approximately 30 km/h if, over several seconds, the distance maintained to the vehicle travelling in front is insufficient for the driven speed. In this case, the warning lamp in the driver's display lights up. If the distance to the vehicle in front continues to decrease at higher speeds, the warning lamp begins to flash.
Collision warning can assist you in the following situations from approximately 7 km/h with an intermittent warning tone and the warning lamp.
Vehicles with PRE-SAFE®: depending on the country, an additional haptic warning occurs in the form of slight, repeated tensioning of the seat belt.
At speeds up to approximately 250 km/h when approaching vehicles ahead.
At speeds up to approximately 120 km/h when approaching crossing vehicles, pedestrians and cyclists.
At speeds up to approximately 100 km/h when approaching stationary vehicles.
At speeds up to approximately 80 km/h when approaching cyclists ahead.
At speeds up to approximately 70 km/h when approaching stationary pedestrians and cyclists.
At speeds up to approximately 250 km/h when approaching vehicles ahead.
At speeds up to approximately 120 km/h when approaching crossing vehicles, pedestrians and cyclists.
At speeds up to approximately 100 km/h when approaching stationary vehicles.
At speeds up to approximately 80 km/h when approaching cyclists ahead.
At speeds up to approximately 70 km/h when approaching stationary pedestrians and cyclists.
At speeds up to approximately 250 km/h when approaching vehicles ahead.
At speeds up to approximately 120 km/h when approaching crossing vehicles, pedestrians and cyclists.
At speeds up to approximately 100 km/h when approaching stationary vehicles.
At speeds up to approximately 80 km/h when approaching cyclists ahead.
At speeds up to approximately 70 km/h when approaching stationary pedestrians and 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
Reaction up to speeds of approximately 100 km/h
Warning for oncoming road users through acoustic warning and warning lamp
Autonomous braking application in order to reduce the severity of an accident
Evasive Steering Assist cannot always recognise objects or complex traffic situations clearly.
Moreover, the steering support provided by Evasive Steering Assist is not sufficient to avoid a collision.
Detection of pedestrians, cyclists and vehicles.
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 110 km/h.
The steering support of Evasive Steering Assist can be cancelled at any time by counter steering.
Full system performance is not yet available for a short time after switching on the vehicle or after driving off. As long as the functions are restricted, the warning lamp can also be shown in the driver's display. Depending on the environmental conditions, it may take a few minutes before full system performance is available.
If Active Brake Assist is deactivated or the functions are restricted, e.g. due to activation of another driving system, the display message appears in the driver's display.
If the system is unavailable due to dirty or damaged sensors or due to a fault, or if the functions are restricted, the warning lamp appears in the driver's display.
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. MoreMore
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.
In complex traffic situations where objects cannot always be clearly identified.
If pedestrians, cyclists or vehicles move quickly into the sensor detection range.
If road users are hidden by other objects or are located close to other objects.
If the typical outline of a pedestrian or cyclist cannot be distinguished from the background.
If a pedestrian or cyclist is not detected as such, e.g. due to special clothing or other objects.
If the driver's seat belt is not fastened.
On bends with a tight radius.
You can watch an animation on this topic via the following link: