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  • S-Class
  • Saloon
  • 08/2019
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Function of Active Brake Assist with cross-traffic function
Active Brake Assist consists of the following functions:

  • Distance warning function

  • Autonomous braking function

  • Situation-dependent braking assistance

  • Evasive Steering Assist

Active Brake Assist can help you to minimise the risk of a collision with vehicles 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 instrument cluster.

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.

WARNING Risk of an accident if the detection of Active Brake Assist with cross-traffic function is impaired

Active Brake Assist with cross-traffic function cannot always recognise objects or complex traffic situations clearly.

In such cases, Active Brake Assist with cross-traffic function can:

  • Give a warning or brake without reason

  • Not give a warning or not brake

Always pay careful attention to the traffic situation and do not rely entirely on Active Brake Assist with cross-traffic function. Active Brake Assist with cross-traffic function is only an aid. The driver is responsible for maintaining a suitable distance to the vehicle in front, vehicle speed and for braking in good time.
Be prepared to brake or swerve if necessary.

If the system is unavailable, the message appears in the multifunction display.

Also observe the system limits of Active Brake Assist with cross-traffic function.

The individual subfunctions are available in the following speed ranges:

Distance warning function

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 insufficient 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.

Brake immediately or take evasive action, provided it is safe to do so and the traffic situation allows this.

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

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

  • Speeds up to approximately 80 km/h when approaching stationary vehicles.

  • Speeds up to approximately 60 km/h when approaching crossing pedestrians.

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:

  • Speeds up to approximately 200 km/h when approaching vehicles ahead.

  • Speeds up to approximately 50 km/h when approaching stationary vehicles.

  • Speeds up to approximately 60 km/h when approaching crossing pedestrians.

Situation-dependent braking assistance
The situation-dependent braking assistance can intervene from a speed of approximately 7 km/h in the following situations:

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

  • Speeds up to approximately 80 km/h when approaching stationary obstacles.

  • Speeds up to approximately 60 km/h when approaching crossing pedestrians.

Cancelling a brake application initiated by Active Brake Assist with cross-traffic function

You can stop a brake application initiated by Active Brake Assist with cross-traffic function at any time by fully depressing the accelerator pedal or with kickdown.

Active Brake Assist with cross-traffic function can stop the brake application if 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.

Evasive Steering Assist
Evasive Steering Assist has the following characteristics:

  • 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.

WARNING Risk of an accident despite Evasive Steering Assist

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.

In such cases Evasive Steering Assist can:

  • give an unnecessary warning or provide assistance

  • not give a warning or not provide assistance

Always pay careful attention to the traffic situation; do not rely on Evasive Steering Assist alone.
Be ready to brake and take evasive action, if necessary.
Prevent the assistance by actively steering in non-critical driving situations.
Drive at an appropriate speed if pedestrians are close to the path of your vehicle.
System limits

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

The system may be impaired or may not function 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.

  • 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 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 sensor system adjusts automatically while a certain distance is driven after the vehicle has been delivered. During this teach-in period, Active Brake Assist is unavailable or only partially available.

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