The Rear left right shock absorber is mainly used to suppress the shock and the impact from the road surface when the spring is rebounding after shock absorption. The shock absorber is used to restrain the spring from bouncing back and forth although it can filter the vibration of the uneven road surface. shock absorbers and elastic components bear the task of slow impact and shock absorption too much damping force will make the suspension elastic deterioration and even damage the shock absorber connector. Therefore it is necessary to adjust the contradiction between elastic components and shock absorbers. Shock absorbers should be neither too soft nor too hard. If the shock absorber is too soft the body will jump up and down and if the shock absorber is too hard it will cause too much resistance preventing the spring from working properly.