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The article is the third one of series of the authors' SAE Papers (other two: 2002-01-0619, 2005-01-1261) concerning modeling and simulation studies of strong non-linear processes in a car steering system. Here, attention is concentrated on the stick-slip phenomenon caused by the dry friction. The studies focus on the influence of different kinds of friction force characteristics (from Coulomb-type to Stribeck-type) on the steering system dynamics. We present mathematical models and simulation studies of the stick-slip phenomena in a typical steering mechanism. The simulations concern the open loop tests (sinusoidal input and combination of ISO maneuvers) and provide materials for a sensitivity analysis (different friction models and vehicle motion conditions).