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Power Steering is a system that uses hydraulic fluid or electrical assistance to reduce the driver's efforts in using the steering wheel at lower speeds. Once the speed increase, the Power Steering system adapts to it. It enables the driver to help steer the vehicle by augmenting steering efforts to maneuver, making it easier for the vehicle to turn at lower speeds.

  • Most power steering systems are basically manual steering systems with a power booster added. In a power recirculating-ball steering gear, the booster is a power cylinder and piston built into steering gear. This is known as integral power steering.
  • A linkage power steering system can be linked to the manual steering system that has a pitman-arm steering gear. The power cylinder connects the vehicle body and steering linkage to provide the power assist.
  • All hydraulic power-steering systems work in the same general way; the hydraulic pump pressurizes the fluid. Steering effort applied to the steering wheel causes the control valve to open and close fluid passages. 
  • These may either let the pressure fluids enter into the power cylinder or relieve the pressure. 
  • The pressurized fluid causes the piston to move, providing most of the steering effort.