The strut can actually be considered one of the components of the car's wheel system that transfers the weight of the car's body and body to the ground and wheels. This part, also known as the wheel seat, is installed on the steering axle, which is the axle or steering knuckle, and enables the wheels to rotate around this axis. This small and inexpensive metal part plays a pivotal role in the car's front suspension. In this way, it acts like a hinge, connecting the brake discs, shock absorbers and their connections, connecting these parts together.

The strut is considered to be almost the most key part of the front suspension, as part of the wheel and suspension system components are attached to it. The strut is made of cast iron.

The functions of the steering knuckle are briefly as follows:

Holding the wheels
The point where the brake discs, steering wheel, hub and other wheel connections intersect
The location of the auxiliary rod connections in the MacPherson suspension system
Moving the wheels in the direction desired by the driver
A hinge for the wheel to rotate on the steering axle
A device for mounting the wheel on its axis