The suspension system absorbs shock and vibration from the road so your body doesn't have to. Suspension also plays a critical safety role by working to continuously keep all four tires on the ground for maximum traction, braking, and steering capability.
Each individual wheel moves up or down independently without affecting other wheels. There are two main independent suspension designs:
Both double-arm and the McPherson suspensions use sway bars to transfer movement from one side of the car to the other in order to prevent it from flipping over during a turn. The sway bars are attached to the chassis by sway bar end links and sway bar bushings.
Live (Solid) Axle
The second design, a live (solid) axle, moves up and down like a see-saw, affecting the height of the wheel on the opposite side. Although less adept at maintaining traction, this type of suspension is stronger and more common on rear axles, and is especially common on trucks.
Live axle designs commonly use leaf springs rather than coil springs, shocks, or struts. Although this arrangement doesn't effectively provide a comfortable ride, it better distributes loads evenly, which is why this type of suspension is generally found on trucks and larger vehicles.