BAS (Brake Assist) - What is BAS (Brake Assist)?

The electro-hydraulic braking system, in a critical situation, establishes the highest braking power independently of the pedal pressure and thus significantly shortens the stopping distance

Numerous accidents happen unnecessarily, because drivers brake too vigorously or hesitantly at first. When they realize the gravity of the situation and step on the brake, it is often too late. Lost meters of stopping distance are difficult to make up for. This was the motive for the Daimler-Benz experts (today Daimler) to initiate the development of a brake support system in the early 1990s. In early 1996 at Mercedes-Benz The BAS (Brake Assist) system was introduced to the S and SL classes, which in the critical situation, independently of the brake pedal pressure, establishes the highest braking intensity. Thus, the stopping distance is significantly shortened, which is crucial to avoid an accident.

BAS is an electro-hydraulic system made on the basis of a classic brake servos. With the help of a diaphragm and an underpressure chamber (engine energy generated), it exerts additional force on the piston of the master brake cylinder. An essential assembly is an energy (vacuum) tank, which at all times has sufficient energy to achieve the strongest braking. 'Smart electronics' recognizes the driver's panic response and, regardless of the brake pedal pressure, establishes the maximum braking force at the limit of the ABS.

The BAS is activated by a solenoid valve, which in a tenth of a second increases the vacuum in the vacuum chamber and generates additional braking force. The brake support system operates autonomously and ensures braking at the limit of physical capabilities (grip of the tire and the ground), as long as the driver keeps the brake pedal depressed. This is especially beneficial for hesitant drivers.

After the three-star model, and since 1998 BAS has become standard in all Mercedes-Benz models, the system has been used by other manufacturers as well. Since November 2007, it is mandatory in all new cars. In addition to the abbreviations BAS and BA, for Brake Assist, the abbreviation EBA (Emergency Brake Assist) is used.

Author: Zeljko Marusic
Retrieved from: autoportal.hr