Abstract: A steer wheel control system having a centering unit for holding center by resisting off-center movement of the steered wheels of a vehicle and returning them to a selected center position after each such movement, and a trim unit for remotely varying the selected center position. The resistance and return forces may also be varied. A plurality of passages and check valves in a remote trim valve assembly make the trim unit operable by a single solenoid valve mounted on a remote manifold that is in fluid communication with passages in an intermediate head between the trim unit and the centering unit. A 3-way valve between a fluid accumulator and the centering unit provides depressurization of the centering unit in the absence of electrical power or upon a loss of power steering.