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  • E-Class
  • Saloon
  • 08/2019
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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

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 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 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

Always pay careful attention to the traffic situation; do not rely on Active Brake Assist alone. Active Brake Assist 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.

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
Situation-dependent braking assistance may intervene at speeds above 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 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.

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 radar sensor system 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.