This paper focuses on the test bench-based application and analysis of electro-mechanical power steering (EPS). In the first part, the setup and physical structure of the test bench are described. It is shown how control parameter changes can be measured, using the assistance amplification as an example. In the next chapter, a method for a test bench-based pre-application is introduced. A hardware change in the servo-unit alters the steering feel and requires compensating that by changing the control parameters of the current (electrical) controller. The method of Design of Experiments is introduced to reduce the number of combinations of the control parameters. Based on the predefined test plan, measurements are made to create an empirical model. This model is further used in an optimisation problem to compute the optimal set of parameters. This optimum is validated by additional measurements.