Bushings can flex and move while retaining stiffness and the ability to return to their original shape and position.They cushion the suspension system which in turn controls noise and vibrations and also provide a softer ride over bumps.

A control arm connects the wheel hub and steering knuckle to the frame of the vehicle. They are typically equipped with bushings on the frame side of the vehicle and a ball joint on the wheel side of the vehicle that allow flex and controlled movement according to road conditions and steering input from the driver.

Control arms allow wheels to move up and down while preventing forward and rearward movement.