What do shock absorbers do?
The main role of the shock absorber is to control spring and suspension movement. Although it is widely believed that they also support the weight of the car it isn’t so. Shock absorbers change the kinetic energy of the suspension and create heat which is drained through the hydraulic fluid.
Shock absorbers can be seen as mini oil pumps. As the suspension moves up and down, the hydraulic liquid is pushed through orifices inside the piston which helps to slow down the piston causing the spring and the suspension to slow down too.
How much a shock absorber can take depends mostly on the suspension and the size and number of these aforementioned orifices in the piston. All modern shock absorbers are speed sensitive hydraulic damping devices - meaning the faster the suspension moves, the more resistance the shock absorber provides.
Because of this feature, shock absorbers adjust to road conditions helping shock absorbers reduce:
Bounce
Roll or sway
Brake dive and Acceleration squat
Struts defined .
A strut is an essential structural part of a suspension. Struts perform two main jobs. First, struts perform a damping function like shock absorbers. Struts also perform a second job. Unlike shock absorbers, struts provide structural support for the vehicle suspension, support the spring, and hold the tire in an aligned position.
Since struts are lighter and smaller than shock absorbers, they take less space in the typical suspension systems. Normally, struts are placed where the upper control arm and the upper joint ball usually are in these typical suspension systems.
Additionally, they take much of the side load placed on the vehicles suspension. As a result, struts have impact on riding comfort and handling as well as vehicle control, braking, wheel alignment and wear on other suspension.
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