Voltage supply for logic and power electronics of a Radstellers

The invention relates to a Wheel brake actuator having at least one power supply device (10, 11), at least one output stage (15) for controlling a brake valve, and an electronic unit (20) for driving the at least one power amplifier (15) and for receiving and transmission of vehicle-specific data to a central control and / or regulation unit. DOLLAR A The invention is characterized in that in a switching off of the power supply for the at least one power amplifier (15), the electronics unit (20) is supplied with voltage continues, wherein the monitoring device (30) is provided, the (error-free function of the electronic unit 20) monitors.