Answer: Body roll is bad. It reduces your vehicle’s traction by rolling your vehicle’s weight to one side during a turn. Sway bars keep your inside wheels in contact with the road surface. If your sway bar failed, the inside tires can actually lift from the surface of the road, and you can lose control of your vehicle. If this happens, your vehicle is also in danger of rolling over. Sway bars allow you to keep control of your vehicle through turns.