Brake control module for a first trailer of a heavy goods vehicle, having (a) a towing vehicle interface which comprises (i) a towing vehicle CAN interface for connection to a towing vehicle CAN connection of a towing vehicle, (ii) a towing vehicle voltage supply interface for connection to a towing vehicle voltage supply connection of the towing vehicle, and (iii) a towing vehicle warning lamp interface for connection to a towing vehicle warning lamp connection of the towing vehicle, and (b) a second trailer interface for connecting a second trailer which is coupled to the first trailer, which second trailer interface comprises (i) a second trailer CAN interface for connection to a second trailer CAN connection of the second trailer, (ii) a second trailer voltage supply interface for connection to a voltage connection of the second trailer, and (iii) a second trailer warning lamp interface for connection to a second trailer warning lamp connection of the second trailer, characterized in that the towing vehicle interface can be connected to the towing vehicle via a single towing vehicle connection plug, and in that the towing vehicle connection plug is connected by means of a single towing vehicle connection cable, and the second trailer interface can be connected to the second trailer via a single second trailer connection plug, and in that the second trailer connection plug is connected by means of a single second trailer connection cable. (a) a towing vehicle interface which comprises (i) a towing vehicle CAN interface for connection to a towing vehicle CAN connection of a towing vehicle, (ii) a towing vehicle voltage supply interface for connection to a towing vehicle voltage supply connection of the towing vehicle, and (iii) a towing vehicle warning lamp interface for connection to a towing vehicle warning lamp connection of the towing vehicle, and (i) a towing vehicle CAN interface for connection to a towing vehicle CAN connection of a towing vehicle, (ii) a towing vehicle voltage supply interface for connection to a towing vehicle voltage supply connection of the towing vehicle, and (iii) a towing vehicle warning lamp interface for connection to a towing vehicle warning lamp connection of the towing vehicle, and (b) a second trailer interface for connecting a second trailer which is coupled to the first trailer, which second trailer interface comprises (i) a second trailer CAN interface for connection to a second trailer CAN connection of the second trailer, (ii) a second trailer voltage supply interface for connection to a voltage connection of the second trailer, and (iii) a second trailer warning lamp interface for connection to a second trailer warning lamp connection of the second trailer, characterized in that the towing vehicle interface can be connected to the towing vehicle via a single towing vehicle connection plug, and in that the towing vehicle connection plug is connected by means of a single towing vehicle connection cable, and the second trailer interface can be connected to the second trailer via a single second trailer connection plug, and in that the second trailer connection plug is connected by means of a single second trailer connection cable. (i) a second trailer CAN interface for connection to a second trailer CAN connection of the second trailer, (ii) a second trailer voltage supply interface for connection to a voltage connection of the second trailer, and (iii) a second trailer warning lamp interface for connection to a second trailer warning lamp connection of the second trailer, the towing vehicle interface can be connected to the towing vehicle via a single towing vehicle connection plug, and in that the towing vehicle connection plug is connected by means of a single towing vehicle connection cable, and the second trailer interface can be connected to the second trailer via a single second trailer connection plug, and in that the second trailer connection plug is connected by means of a single second trailer connection cable.