Symptom Related Diagnostic Procedures: Diagnosis and Testing

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There is some noise in all power steering systems. One of the most common is a hissing sound evident at a standstill parking. Or when the steering wheel is at the end of its travel. Hiss is a high frequency noise similar to that of a water tap bearing closed slowly. The noise is present in all valves that have a high velocity fluid passing through an orifice. There is no relationship between this noise and steering performance.