Valve arrangement (14.1, 14.2, 14.3, 14.3', 14.4) of a tractor vehicle for controlling a pneumatic brake system of a trailer vehicle, wherein the valve arrangement has a trailer control valve with a reservoir pressure input for the introduction of reservoir compressed air and a reservoir pressure output for the controlled discharge of reservoir compressed air, wherein the reservoir pressure output is pneumatically connected to a "reservoir" coupling head of the tractor vehicle, and in which, by means of the trailer control valve, a brake control pressure (p B) can be set and can be conducted via a brake control output of the trailer control valve to a "brake" coupling head of the tractor vehicle, and with an electronically controllable parking brake module, by means of which an inverted control input of the trailer control valve can be ventilated for the actuation of the wheel brakes of the trailer vehicle in a parking brake function, characterized in that, in a brake control line between the brake control output and the "brake" coupling head and/or in a reservoir pressure line between the reservoir pressure output and the "reservoir" coupling head, there is arranged in each case one shut-off and ventilation valve (94, 96; 98, 106, 110), by means of which, when the parking brake is activated, before the connection of the coupling heads of the trailer vehicle to the coupling heads (6, 8) of the tractor vehicle, the respective output (p21, p22) of the trailer control valve can be shut off and the associated coupling head (6, 8) of the tractor vehicle can be ventilated, and by means of which, after the connection of the coupling heads of the trailer vehicle to the coupling heads (6, 8) of the tractor vehicle, the respective output (p21, p22) of the trailer control valve is pneumatically connectible again to the associated coupling head (6, 8) of the tractor vehicle. wherein the valve arrangement has a trailer control valve with a reservoir pressure input for the introduction of reservoir compressed air and a reservoir pressure output for the controlled discharge of reservoir compressed air, wherein the reservoir pressure output is pneumatically connected to a "reservoir" coupling head of the tractor vehicle, and in which, by means of the trailer control valve, a brake control pressure (p B) can be set and can be conducted via a brake control output of the trailer control valve to a "brake" coupling head of the tractor vehicle, and with an electronically controllable parking brake module, by means of which an inverted control input of the trailer control valve can be ventilated for the actuation of the wheel brakes of the trailer vehicle in a parking brake function, characterized in that, in a brake control line between the brake control output and the "brake" coupling head and/or in a reservoir pressure line between the reservoir pressure output and the "reservoir" coupling head, there is arranged in each case one shut-off and ventilation valve (94, 96; 98, 106, 110), by means of which, when the parking brake is activated, before the connection of the coupling heads of the trailer vehicle to the coupling heads (6, 8) of the tractor vehicle, the respective output (p21, p22) of the trailer control valve can be shut off and the associated coupling head (6, 8) of the tractor vehicle can be ventilated, and by means of which, after the connection of the coupling heads of the trailer vehicle to the coupling heads (6, 8) of the tractor vehicle, the respective output (p21, p22) of the trailer control valve is pneumatically connectible again to the associated coupling head (6, 8) of the tractor vehicle.