BMW Z4 owners have reported 2 problems related to hydraulic power assist steering system (under the steering category). The most recently reported issues are listed below.
2003 BMW Z4. Consumer states that the power steering shut off while driving. Consumer states that the dealers have told him that they have no knowledge of the NHTSA bulletin. The consumer stated prior the power steering shutting off, the icon illuminated on the dashboard.
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I have had the same problem for the past two summers regarding the steering when the car sets in the heat all day (except that it was worst this past summer, it now happens at about 85 f, instead of 90 f). The problem is that the car resists turning from center and when it does it will not return to center on its own; you must turn it back. This is a fairly dangerous problem if you are not aware of it and do not pay close attention.