It is not uncommon for the power steering rack to develop a fluid leak requiring replacement of the rack assembly. Loss of power steering fluid may also cause an abnormal noise and damage to the power steering pump.Google+
Car Problem Reports
Mercedes-Benz ML320 Steering Rack Prone to Lleaks
Mercedes-Benz ML320 Problem
Average Mileage: 129,750 mi (93,000 mi - 170,000 mi)
There is a recall on this problem...
Visitor, 2002 Mercedes-Benz ML320
Same here, i now need a Power Steering Pump, plus a list of other things that have quit working..Very disappointed.
Visitor, 2002 Mercedes-Benz ML320, 170,000 mi
Second rack is leaking
Visitor, 2000 Mercedes-Benz ML320, 150,000 mi
it leaks power steering fluid