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  • C-Class
  • Estate
  • 06/2021
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Function of Active Brake Assist
Active Brake Assist consists of the following functions:

  • Distance warning function

  • Autonomous braking function

  • Situation-dependent braking assistance

  • Vehicles with Driving Assistance Package: 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.

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.

WARNING Risk of an accident caused by limited detection performance of Active Brake Assist

Active Brake Assist cannot always clearly identify objects and complex traffic situations.

In such cases, Active Brake Assist might:

  • 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.

Always pay careful attention to the traffic situation; do not rely on Active Brake Assist alone.
Be prepared to brake or swerve if necessary.

If Active Brake Assist is deactivated, appears in the driver's display.

If the system is unavailable or the functions are restricted, appears.

Also observe the system limits of Active Brake Assist.

The individual subfunctions are available in the following speed ranges:
The distance warning function issues a warning in the following situations:

  • From approximately 30 km/h if, over several seconds, the distance maintained to the vehicle travelling in front is too close for the driven speed, the distance warning lamp lights up in the driver's display.

  • From approximately 7 km/h if your vehicle is critically close to a vehicle, cyclist or pedestrian, you will hear an intermittent warning tone and the distance warning lamp lights up in the driver's display.

    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 possible, brake immediately or manoeuvre to avoid the obstacle.

Distance warning function

The distance warning function can aid you in the following situations with an intermittent warning tone and a warning lamp:

Vehicles without Driving Assistance Package:

  • At speeds up to approximately 250 km/h when approaching vehicles ahead.

  • At speeds up to approximately 80 km/h when approaching stationary vehicles, pedestrians walking in the direction of travel and cyclists ahead

  • At speeds up to approximately 70 km/h when approaching crossing pedestrians and cyclists.

  • At speeds up to approximately 60 km/h when approaching stationary pedestrians and cyclists.

Vehicles with Driving Assistance Package:

  • 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.

Autonomous braking function

If the vehicle is travelling at speeds above approximately 7 km/h, the autonomous braking function may intervene in the following situations:

Vehicles without Driving Assistance Package:

  • At speeds up to approximately 250 km/h when approaching vehicles ahead.

  • At speeds up to approximately 80 km/h when approaching cyclists ahead, pedestrians walking in the direction of travel and stationary vehicles.

  • At speeds up to approximately 70 km/h when approaching crossing pedestrians and cyclists.

Vehicles with Driving Assistance Package:

  • 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.

Situation-dependent braking assistance

If the vehicle is travelling at speeds above approximately 7 km/h, situation-dependent braking assistance may intervene in the following situations.

Vehicles without Driving Assistance Package:

  • At speeds up to approximately 250 km/h when approaching vehicles ahead.

  • At speeds up to approximately 80 km/h when approaching cyclists ahead, pedestrians walking in the direction of travel and stationary vehicles.

  • At speeds up to approximately 70 km/h when approaching crossing pedestrians and cyclists.

  • At speeds up to approximately 60 km/h when approaching stationary pedestrians and cyclists.

Vehicles with Driving Assistance Package:

  • 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.

Cancelling a brake application of Active Brake Assist
You can cancel a brake application of Active Brake Assist at any time by:

  • Fully depressing the accelerator pedal or with kickdown.

  • Releasing the brake pedal.

Active Brake Assist may cancel the brake application when one of the following conditions is fulfilled:

  • 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 to oncoming road users (only vehicles with Driving Assistance Package)
Active Brake Assist can also react to detected oncoming road users:

  • 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 (only vehicles with Driving Assistance Package)
WARNING Risk of accident despite Evasive Steering Assist

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.

Always pay careful attention to the traffic situation; do not rely on Evasive Steering Assist alone.
Be prepared to brake or swerve if necessary.
End the support by actively steering in non-critical situations.
Drive at an appropriate speed if there are pedestrians close to the path of your vehicle.
Evasive Steering Assist has the following characteristics:

  • 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.

System limits

Full system performance is not yet available for a few seconds after switching on the vehicle or after driving off.

If the system is unavailable or the functions are restricted, the warning lamp appears in the driver's display.

The system may be impaired or may not function, particularly in the following situations:

  • 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 More.

  • 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.

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 the teach-in process.