The invention relates to a unit which comprises an electric motor (1), an intermediate housing (2) and a controller (3) and can be easily assembled. Said units are frequently used in braking systems, the intermediate housing (2) containing a pump and valves. The unit can be compact in structure if the motor (1) is arranged on one side of the intermediate housing (2) and the electronic controller (3) is arranged on the other side. The electrical connection of the controller (3) and the motor (1) is achieved by a line (20) which is conveyed through conduits (21, 22) in the intermediate housing (2) or in the controller housing (4). The cross-section of the conduits (21, 22) is just slightly larger than the external diameter of the line (20). Consequently, a compact but flexible line can be used which, when supported by the conduit walls, can be inserted into a plug-in connector (11) on the circuit board of the electronic controller.