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Front Assist

The Front Assist ambient traffic monitoring system uses a radar sensor to detect situations where the distance to the vehicle in front is critical and helps to reduce the vehicle’s stopping distance. In dangerous situations the system alerts the driver by means of visual and acoustic signals and with a warning jolt of the brakes. Front Assist is a component of ACC automatic distance control, but it operates independently and even when the distance and cruise control system is switched off. Front Assist responds in two stages when the gap is critically reduced: In the first stage it alerts the driver by means of acoustic and visual signals to vehicles suddenly braking or travelling slowly ahead, and to the associated risk of collision. At the same time the vehicle is “prepared” for emergency braking. The brake pads are applied to the brake discs without slowing the vehicle down and the responsiveness of the hydraulic brake assist system is switched to more sensitive. If the driver does not respond to the warning, in the second stage his attention is drawn to the impending collision by a short jolt of the brakes, and the responsiveness of the brake assist system is increased still further. If the driver then applies the brakes, the full braking power is immediately available. If the braking is not hard enough, Front Assist increases the braking pressure to the necessary degree so that the vehicle is brought to a standstill ahead of the obstacle.

Front Assist performs two further functions on certain models. After the collision warning, Front Assist automatically and independently initiates partial braking, which is sufficient to slow the vehicle down and to re-establish the driver’s attention.

In situations where a collision is unavoidable, the driver is also assisted by automatic emergency braking. Front Assist brakes the vehicle to the maximum degree in order to reduce the impact speed and to minimise the severity of the collision as much as possible.