AB - Adaptive brake

Basically it is an emergency braking assistance system with a few more functions. The integrated adaptive braking system enhances driving comfort and safety by supporting the most dangerous braking maneuvers with the basic functions of the anti-lock braking system (ABS) and alleviating the most difficult driving situations with the comfort functions. It also includes the HOLD function, which acts as a parking brake and is activated by lightly pressing the accelerator pedal.

The HOLD function prevents the vehicle from unintentionally moving on slopes, at red lights or when driving with stops.

Mercedes-Benz GLK Adaptive Brake Technology