A power steering system has a power steering control system configured to control the power steering system, a first power steering pump configured to be driven by a propulsion source of the vehicle, a second power steering pump configured to be driven by the rotation of the wheels of the vehicle. The first power steering pump is a controllable pump operatively connected to the power steering control system and the power steering control system is configured to control said first power steering pump. The first and second power steering pump are connected to a common power steering fluid circuit such that said first and second power steering pump can operate in parallel to simultaneously provide power steering assistance.