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  • 03/2018
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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, you will be warned visually and acoustically.

If you do not react to the visual or acoustic warning, autonomous braking can be initiated in critical situations.

If there are pedestrians and cyclists crossing: in especially critical situations, Active Brake Assist can initiate autonomous braking directly. In this case, the visual and acoustic warning occurs simultaneously with the braking application.

If you apply the brake yourself in a critical situation, or apply the brakes during autonomous braking, situation-dependent braking assistance occurs. The brake pressure increases up to maximum full-stop braking if necessary. Situation-dependent braking assistance only intervenes when the brakes are applied firmly; otherwise, it remains within the autonomous braking process.

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

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

Due to the nature of the system, complex driving conditions may also cause Brake Assist to intervene or not intervene without reason. In such cases, and in the event of Active Brake Assist malfunctioning, the brake system will continue to be available with full brake boost and BAS.

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 of the vehicle is responsible for keeping a sufficiently safe distance to the vehicle in front, for vehicle speed and for braking in good time.
Be prepared to brake or swerve if necessary.

Also observe the system limitations of Active Brake Assist.

The individual subfunctions are available in the following speed ranges:

Distance warning function

The distance warning function warns you in the following situations:

  • At speeds greater than 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 then lights up in the instrument cluster.

  • At speeds greater than approximately 7 km/h, if your vehicle is critically close to a vehicle or pedestrian.

    An intermittent warning tone sounds 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:

  • vehicles travelling in front: up to approximately 250 km/h

  • stationary vehicles: up to approximately 200 km/h

  • crossing vehicles: no reaction

  • crossing pedestrians/cyclists: up to approximately 60 km/h

  • stationary pedestrians: no reaction

Autonomous braking function
The autonomous braking function may intervene at speeds starting from approximately 7 km/h in the following situations:

  • vehicles travelling in front: up to approximately 250 km/h

  • stationary vehicles: up to approximately 200 km/h

  • crossing vehicles: no reaction

  • crossing pedestrians/cyclists: up to approximately 60 km/h

  • stationary pedestrians: no reaction

Situation-dependent braking assistance
Situation-dependent braking assistance may intervene at speeds starting from approximately 7 km/h in the following situations:

  • vehicles travelling in front: up to approximately 250 km/h

  • stationary vehicles: up to approximately 80 km/h

  • crossing vehicles: no reaction

  • crossing pedestrians/cyclists: up to approximately 60 km/h

  • stationary pedestrians: no reaction

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.

  • Fully releasing the brake pedal (only during situation-dependent braking assistance).

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

  • The sensors are affected by snow, rain, fog or heavy spray.

  • The sensors are dirty, misted up, damaged or covered.

  • The sensors are affected by 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.

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

The system may not react correctly in the following situations:

  • In complex traffic situations, objects may not always be clearly detected.

  • Pedestrians or vehicles move quickly into the detection range of the sensors.

  • Pedestrians are obscured by other objects.

  • In bends with a narrow radius.

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