Patent ID: 7992691

Claim:
Method for operating a parking brake having an actuator, wherein the actuator is driven with a direct current motor which can be operated in two directions and which moves a piston of the actuator and, via a self-locking gear mechanism of the actuator, at least one brake shoe for applying or releasing the parking brake, wherein a control unit is provided for performing open-loop or closed-loop control of the movement of the direct current motor, wherein in order to perform open-loop or closed-loop control of the movement of the direct current motor in order to apply the parking brake with a desired, predefined brake-application force, the control unit determines a maximum current value which is taken up by the direct current motor, the application of the brake is carried out by a corresponding movement of the direct current motor, and the movement of the direct current motor which leads to the application of the parking brake is ended after the maximum current value has been reached, wherein, in determining the maximum current value, the control unit takes into account a first component comprising a hydraulic admission pressure which is currently present at the piston if the brake is applied or was present at the piston if the brake has been released when it had previously been applied.