Quote:
Originally Posted by TK421BMW
So only at low speeds otherwise it's just "mitigation" where it starts the breaking process for you to finish. Could be dangerous to have it slam on the brakes when you just meant to come up and "encourage someone" going slow in the fast lane to move.  |
It is not clear but definitely does braking above low speeds, at least to 50mph. It looks auto braking for the front, should kick in at 3mph. I have not run into anything in the manual addressing auto-braking on the rear.
Some info from the manual:
Approach control warning with light braking function
Concept
The system can help prevent accidents. If an accident cannot be prevented, the system will help reduce the impact speed.
The system sounds a warning before an imminent collision and activates brakes independently, if needed.
General information
Depending on the equipment version, the system is controlled by the following sensors:
Camera in the area of the interior mirror.
The system issues a two-phase warning of a possible risk of collision with vehicles at speeds above approx. 3 mph/5 km/h. Time of warnings may vary with the current driving situation.
With the vehicle approaching another vehicle intentionally, the approach control warning and braking are delayed in order to avoid false system reactions.
Prewarning
This warning is provided, for instance when there is impending danger of a collision or the distance to the vehicle ahead is too small.
If a prewarning is provided, respond by braking as warranted.
Acute warning with braking function
Acute warning is displayed in case of the imminent danger of a collision when the vehicle approaches another object at a high differential speed.
If an acute warning is issued, intervene in the situation yourself. Depending on the driving situation, the acute warning may be accompanied by a brief activation of the braking system.
With the warning time setting "Late" the brief activation of the braking system is omitted.
If necessary, the system provides additional assistance, such as with an automatic braking intervention, in a possible risk of collision.
Acute warnings can also be triggered without previous forewarning.
Braking intervention
The warning prompts the driver to react. During a warning, the maximum required braking force is used when the brake is actuated. Prerequisite is sufficiently quick and hard stepping on the brake pedal.
The system can additionally assist possibly with automatic braking intervention if there is a risk of a collision.
When the vehicle is traveling at a low speed, the vehicle may come to a complete stop.
City brake function: the braking intervention occurs to up to approx. 50 mph/80 km/h.
The braking intervention occurs only if vehicle stability has not been restricted, for instance by deactivating the DSC Dynamic Stability Control.
The driver may cancel the braking intervention by stepping on the accelerator pedal or by actively moving the steering wheel.
Object detection can be restricted. Follow the limitations of the detection range and functional limitations
Upper speed limit
If the vehicle speed exceeds approx. 155 mph/250 km/h, the system is deactivated temporarily. When the vehicle slows down to below this speed, the system is reactivated.
Person warning with City light braking function
Concept
The system can help prevent accidents involving pedestrians and cyclists. If an accident cannot be prevented, the system will help reduce the impact speed.
The system sounds a warning in the city speed range before an imminent collision and activates brakes independently, if needed.
General information
The system issues a warning of a possible risk of collision with pedestrians and cyclists at speeds above approx. 3 mph/5 km/h.
The system reacts to pedestrians and cyclists who are within the detection range of the system.