A steering system (10) for a vehicle (16) comprises a housing (20) having
first and second end portions (32, 34) and an intermediate portion (50).
A steering member (66) is supported for axial movement in the housing
(20). A piston (100) fixed for movement with the steering member (66) has
opposite end faces (104, 106). First and second springs (130, 132) engage
the end faces (104, 106) of the piston (100) and bias the piston and
thereby the steering member (66) in first and second axial directions
toward a straight ahead position. Steering linkage (124, 126) connected
with the piston member (100) transmits movement of the piston member
(100) to steerable wheels (12, 14) of the vehicle.