Electrically actuatable vehicle brake and method for controlling an electrically actuatable vehicle brake

An electrically actuatable vehicle brake, said vehicle brake comprising:

• a brake piston acting on at least one friction lining, said brake piston displaceable out of an initial position into an actuation position, wherein in said actuation position, said brake piston urges said friction lining against a rotating member of said vehicle brake which can be connected, fixed against relative rotation, to a wheel of a motor vehicle, and wherein said brake piston is actuatable by an element of a transmission unit driven by an electric motor and acting on the brake piston;
• and
• a device for releasably holding said brake piston in said initial position, such that a predetermined brake release play is kept constant, wherein said brake release play is defined by at least a distance between said at least one friction lining and said rotating member when said brake piston is in said initial position;
• wherein said electric motor can be triggered by an electronic control unit, said electronic control unit being set up to detect performance parameters of at least one of said vehicle, said electric motor, and said vehicle brake, and further being set up and programmed to trigger said electric motor by means of a control and evaluation program running in said electronic control unit in such a way that to calibrate said brake, said element is displaced in response to the detection of at least one predetermined operating condition in a first direction into said actuation position, and then, said element is displaced in a second direction opposite said first direction, along a path the length of which corresponds to a sum of the predetermined brake release play and a predetermined distance between said element and said brake piston when said brake is not actuated;
• and
• wherein the electronic control unit is set up to trigger the electric motor in such a way that the element of the transmission unit acting on the brake piston is displaced into a predetermined zero position before being displaced into its actuation position and the electronic control unit is further set up to detect a dimension value which is correlated to the length of a path covered by the element between its zero position and its actuation position and to compare the detected dimension value with a stored reference dimension value, the reference dimension value being correlated to the length of a path covered by the element in a vehicle brake fitted with new friction linings.