Called AFU (Aide au Freinage d’Urgence) in francophone countries or EBA (Emergency Brake Assist)/BAS (Braking Assistance System) in Anglo-Saxon countries this system is of paramount importance in the event of emergency braking as long as the driver does not have the necessary power to push with sufficiently high pressure on the brake pedal.
More broadly, the sensors detect an extremely rapid braking, a sudden push on the brake pedal, press which, however, is not strong enough to perform an emergency maneuver. This is the typical case of female drivers who do not have the same muscle as men drivers, but have reaction speed as good as them. At this time, the electronic brain dictates a temporary extra pressure in braking circuit, so that to compensate for the lack of power of pressing.
The system Daimler Benz was developed and Lucas/TRW in 1992.
EBA ensures that full braking force is available whenever necessary, helping to reduce stopping distances in case of emergency. In order to alert other drivers if you have to brake heavily, emergency braking warning illuminate flashing rear brake lights.
From the Manual:
During urgent braking circumstances when it is essential to depress the brake pedal with higher pressure, the brake assist system gives braking assistance, therefore improving braking overall performance.When the brake pedal is depressed hard or depressed more quickly, the brakes apply more firmly. The Braking Guard function is not so perfect, as some people complain in the vehicle forums, in the sense that it sometimes flashes completely without reason, creating dangerous situations without necessity.
- Once the brake pedal is depressed hard or depressed more quickly, the pedal may feel softer however the brakes will apply more firmly. This is a normal a result of the brake assist procedure and does not point out a malfunction.
- When the brake pedal is depressed hard or depressed more quickly, a motor/pump operation noise could be heard. This is a normal effect of the brake assist and does not reveal a failure.
- The brake assist equipment does not supersede the functionality of the vehicle’s primary braking system.