What are strut? Car struts are an important part of a car’s suspension system. They are designed to keep the car’s body from bouncing around while driving on bumpy roads. Struts work by dampening the car’s spring action, which helps to smooth out the ride. In addition, struts help to support the car’s weight and keep the tires in contact with the ground. This helps to improve traction and braking, and it also helps to improve fuel economy. While struts are not required for all cars, they can be a great addition for those who want a smoother ride and better handling.