A fluid leak may develop from one or more power steering hose. When a leak is being repaired, it is not uncommon for multiple hoses to be replaced.Google+
Car Problem Reports
BMW Z3 Multiple Power Steering Hoses May Simultaneously Fail
BMW Z3 Problem
Average Mileage: 90,125 mi (46,500 mi - 155,000 mi)
Visitor, 2001 BMW Z3, 69,000 mi
Power steering hose leak. Cheap fix. New hose.
Visitor, 1997 BMW Z3, 155,000 mi
Had to replace power steering hose from return in the front grill to the pump due to leakage.
Visitor, 2001 BMW Z3, 46,500 mi
Both power steering hoses need replaced due to leakage.
Visitor, 1999 BMW Z3, 90,000 mi
replaced power steering hoses