The car steering system is one of the four major systems of the car chassis,when you repair car and it is also an important part of the car safety system. The mechanical steering system is to rely on the driver to steer the steering wheel to achieve the wheel steering, to a certain extent, increased the driver's Operating strength. Power steering system is under the control of the driver, by means of the car engine to drive the hydraulic pump to produce the liquid pressure or motor drive force to achieve the wheel steering. With the development of automotive technology and electronic technology, many high-end cars have been installed on the electric control electric power steering system.