A torque plate for heavy-duty vehicles includes a reduced size and structural features that enable the torque plate to be used in conjunction with a reduced diameter brake rotor. When the electric motor is not driven, a controller controls a hydraulic circuit system so as to increase output torque of the hydraulic motor by an amount corresponding to torque to be compensated for the non-driving of the electric motor compared to cases where the electric motor is driven. The client device is authenticated based upon verification of the received authentication information.