Electropneumatic trailer parking-brake system, trailer, towing combination

An electropneumatic trailer parking-brake system for a trailer, the electropneumatic trailer parking-brake system comprising:

• an electropneumatic trailer parking-brake module configured for releasing or engaging the electropneumatic trailer parking-brake system in dependence upon an operating signal;
• said electropneumatic trailer parking-brake module having a reservoir port, a parking brake port, a main-valve unit, a pilot-valve unit, a pilot-valve arrangement, and an electronic control unit;
• said reservoir port being configured to receive a reservoir pressure;
• said parking-brake port being for connecting at least one parking-brake cylinder;
• said main-valve unit being configured to receive the reservoir pressure and to deliver a spring-actuator pressure at said parking-brake port in dependence upon a control pressure present at a control port;
• said pilot-valve arrangement being configured to receive the reservoir pressure for providing the control pressure;
• said electronic control unit being configured to receive the operating signal in a form of an electrical operating signal for releasing or engaging the electropneumatic trailer parking-brake system, and to provide an electrical switching signal to said pilot-valve arrangement in dependence upon the operating signal;
• and,
• said pilot-valve arrangement being configured to provide the control pressure in dependence upon the electrical switching signal.