An electropneumatic trailer supply module for an electropneumatic parking brake system for commercial vehicles, in particular tractor vehicle/trailer combinations, the electropneumatic trailer supply module comprising: a supply connection configured to connect a compressed air supply (3, 4), a trailer supply connection configured to deliver a supply pressure (pA) for a trailer vehicle, a pneumatically controlled main valve unit configured to provide the supply pressure (pA) to the trailer supply connection, and an electropneumatic pilot control unit configured to select at least a first control pressure at the pneumatically controlled main valve unit, wherein, when the first control pressure exceeds a predefined first threshold value of the pneumatically controlled main valve unit, the supply pressure (pA) provided to the trailer supply connection can be selected, and when the first control pressure falls below the predefined first threshold value of the pneumatically controlled main valve unit, the trailer supply connection is configured to be vented and wherein the supply pressure (pA) selected by the pneumatically controlled main valve unit can be selected as a second control pressure at the pneumatically controlled main valve unit for the pneumatic maintenance of the selected supply pressure (pA), comprising a feedback line provided to select the supply pressure (pA) selected by the pneumatically controlled main valve unit as the second control pressure on the pneumatically controlled main valve unit, characterized in that the feedback line is connected to the electropneumatic pilot control unit, wherein the electropneumatic pilot control unit is configured to allow the selection of the second control pressure on the pneumatically controlled main valve unit in a currentless switching position. a supply connection configured to connect a compressed air supply (3, 4), a trailer supply connection configured to deliver a supply pressure (pA) for a trailer vehicle, a pneumatically controlled main valve unit configured to provide the supply pressure (pA) to the trailer supply connection, and an electropneumatic pilot control unit configured to select at least a first control pressure at the pneumatically controlled main valve unit, wherein, when the first control pressure exceeds a predefined first threshold value of the pneumatically controlled main valve unit, the supply pressure (pA) provided to the trailer supply connection can be selected, and when the first control pressure falls below the predefined first threshold value of the pneumatically controlled main valve unit, the trailer supply connection is configured to be vented and wherein the supply pressure (pA) selected by the pneumatically controlled main valve unit can be selected as a second control pressure at the pneumatically controlled main valve unit for the pneumatic maintenance of the selected supply pressure (pA), comprising a feedback line provided to select the supply pressure (pA) selected by the pneumatically controlled main valve unit as the second control pressure on the pneumatically controlled main valve unit, characterized in that the feedback line is connected to the electropneumatic pilot control unit, wherein the electropneumatic pilot control unit is configured to allow the selection of the second control pressure on the pneumatically controlled main valve unit in a currentless switching position.