Device and Method for Controlling a Braking System, Braking System and Vehicle

A device for controlling a braking system of a vehicle may include a position sensor device which is designed to detect a position of a brake pedal and/or a piston of a main brake cylinder actuated by the brake pedal at multiple times, a pressure sensor device which is designed to detect a pressure in a fluid located in the cylinder at multiple times, and a control device which is designed to shift a braking assistance device into an activated state. The control device may make the shift when a temporal change of the detected position exceeds a predefined position gradient threshold value and/or if the distance between two detected positions exceeds a predefined position threshold value, wherein the position gradient threshold value or the position threshold value is provided according to a change in the detected pressure.