No car rear shock absorber will not be able to control the rebound of the spring, the car will encounter rough road will produce serious bounce, cornering will also cause the loss of tire grip and tracking due to the vibration of the spring up and down. Hydraulic spring shock absorbers are widely used in automobile suspension system. The principle is that when the frame and the bridge do reciprocating relative movement and the piston in the shock absorber cylinder reciprocating movement, the oil in the shock absorber shell will repeatedly from the inner cavity through some narrow pores into another inner cavity. At this point, the friction between the liquid and the inner wall and the internal friction of the liquid molecules will form a damping force for vibration. The advantages of the shock absorber are large static compression, low natural frequency, low frequency shock absorption; Resistance to oil, water and solvent erosion, not affected by temperature changes; Does not age or creep.