Modern passenger cars are often equipped with telescopic shock absorbers. Among the various shock absorbers of this type, one should distinguish telescopic shock absorbers- and two-pipe. The shock absorber in the vehicle is attached like this, that when the wheel rises or lowers, the same is the movement of the piston in the liquid-filled damper cylinder. There are two holes in the piston: one low-section calibrated one, and the other is greater, closed with a valve. As soon as the wheel hits an uneven road, the piston moves downwards in the cylinder and the valve in the piston opens under the pressure of the liquid, which causes the liquid to flow over the piston through both holes. On the return movement of the piston, while the spring relaxes, the liquid pressure will close the valve in the piston and the liquid will flow from the top to the bottom of the cylinder only through the calibrated hole in the piston, as a result, the fluid flow is impeded and the flow resistance is much greater than during spring bending. This squeezing of the liquid is dampened (brakes) downward movement of the wheel.