The invention relates to a spring-force brake system having a brake operating unit, having at least one sensor for detecting a driver braking demand upon operation of the brake operating unit by the driver, having at least one actuation unit for setting and regulating a braking force. For this purpose, it is provided according to the invention that at least one primary electronic control and regulating unit is provided which is connected at the signal input side to at least one sensor and which activates the actuation unit as a function of or on the basis of the signals of the sensor, and that at least one secondary control and regulating unit is provided which is connected at the signal input side to at least one sensor and which activates the actuation unit on demand on the basis of or as a function of signals of the sensor.