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Check your fluid -- you may be low or empty. Check the hoses connected to the reservoir and pump body -- are they leaking at the connectors or elsewhere?
Rub your finger inside the pulley -- is it very oily? If so, front seal may be leaking.
If all that is OK, check to see if your belt is slipping -- is it squealing? Is it wet or oily? Are other belt-driven components such as the water pump and alternator behaving properly?
If those are OK, the problem may be with the pump itself (which is unlikely, since there isn't much in there to fail) or the steering box. I don't know much about the steering box, so perhaps someone else will chime in.
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2008 E350 4matic / Black/Anthracite
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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black
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