Method and device for ascertaining a clamping force of a braking unit of a motor vehicle

A method for ascertaining a clamping force of a braking unit of a motor vehicle, which includes at least one rotatably mounted wheel and a braking system including at least one braking unit and at least one electric motor. The electric motor includes a motor winding and a rotatably mounted rotor. The rotor is coupled with the brake body so that a clamping force may be generated by a rotation of the rotor, by which a brake body is pressed against a brake element. A rotation angle of the rotor and/or a displacement travel of a displaceably mounted element of the transmission unit is ascertained, and a level of the generated clamping force is ascertained as a function thereof. A level of the clamping force is ascertained as a function of the level of a motor current.