The suspension system:

Springs, shock absorbers and related parts between the wheels and the car body make up the suspension system. A spring at each wheel supports the weight of the vehicle and the load it is carrying. The springs allow the wheels to move up and down as they meet bumps on the road. Automobile suspension systems use four types of springs. These are coil springs,leaf springs, torsion bar springs and air springs. Some cars have electronic ride control which automatically changes the firmness of the shock absorbers to suit road conditions.