In a vehicle combination including a hydraulically braked towing vehicle and a pneumatically braked trailer, a brake module serving as a trailer control valve has an electropneumatic pressure regulating module with an electronic controller that converts pressure signals from a sensor at a hydraulic pressure line from a hydraulically-actuated service brake master cylinder into control pulses for electromagnetic control valves in the regulating module. The control valves are connected via a pneumatic supply pressure inlet to a compressed air reservoir, and via a pneumatic control pressure outlet to a control pressure coupling head. The brake module has a redundancy valve arrangement and is connected via a hydraulic control inlet to the hydraulic pressure line, and via a pneumatic inlet to the reservoir, the hydraulic control pressure determining the magnitude of the pneumatic outlet pressure at an outlet of the redundancy arrangement, which is connected to the coupling head when an electrical/electronic component relevant to brake module operation fails. The pneumatic outlet is disconnected from the coupling head in fault-free operation. The regulating module and redundancy arrangement are connected pneumatically in parallel, and the pneumatic outlet can be connected exclusively to the coupling head.