The linear friction welding apparatus of this invention includes two vibrating assemblies, which simultaneously vibrate both work pieces along different weld axis within the plane of the weld interface during the weld process. By concentrating heat in this central region the process of bonding laser devices to a substrate is greatly improved. The present invention further relates to a system to reduce through dissipation or utilization the available gravity-generated hydraulic pressure so as to deploy a ground engaging drag-brake of a vehicle. An average difference or other typical offset difference may be used to correct the error. The data processing module can receive the operating data, determine whether the operating data indicates the component is operating in an alert condition and can provide an indicator when the component is operating in an alert condition.