In this study the current state of the art in testing equipment for steering systems is investigated firstly. The test equipment used by suppliers mostly used for the proof of endurance strength and are designed for specific driving conditions such as parking. Other test equipment for example coming from the vibration control and cover up test fields as the small-signal excitation. Based on this research, the advantages and disadvantages of the concepts are explained and the requirements for a testing device for steering systems are defined. As a result of this concept work a test bench for steering systems with two linear motors and a step motor is configured in this work. The components are coupled to a vehicle and environment model and controlled by a central real-time environment. With this development environment it is possible to describe a wide range of testing capabilities. The tests series are divided into the fields of characterization in system testing, characterization of the transfer behavior and characterization by driving maneuvers. Among others standardized vehicle tests (e.g. Weave-Test) in the steering system development provide the basis for these test series. The test series with an extended sensor setting for measuring the transfer characteristics of the steering system offer the possibility in various configurations to determine the influence of the steering system components. With the developed test catalog a new test method is available, which allows to conduct an extensive characterization of steering systems. Among others for the detection of the performance of steering systems an efficiency measurement is carried out, which shows the characteristic of the steering system over the whole operating range. Furthermore new findings in relation to the load influence and the rack velocity on the system friction have been resulted. On the basis of a conventional hydraulic and two electric steering systems with different controller concepts a characterization in comparison is presented and the various system characteristics are illustrated and analyzed. The analysis reveals important insights regarding the transfer behavior of the steering system concepts and the influence of the controller concept. It turns out, that the transfer behavior of an electric power steering system in the range up to 10 - 15 Hz can be approximated by the controller concept to a conventional hydraulic steering system. In future with the results of this work the system characteristics of a steering system can be determined and optimized in detail especially with focus on the transfer behavior. Furthermore the possibility is created to transfer vehicle tests to the semi- virtual world on a steering system test bench. The system characteristics at vehicle level can be investigated and standardized tests from the steering system development can be executed under robust testing conditions.