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Control arms connect the steering wheel knuckles and wheel hubs to the car's frame. They allow the wheels to move up and down but prevent them from rolling forward or backward. Most cars have one or two upper and lower control arms per wheel on both the front and wheel suspensions. Most trucks and SUVs use both an upper and a lower control arm, although many front-wheel drive automobiles only use the lower one.
Because they allow tire movement parallel to the car's body, control arms are an essential component of a car's suspension system. They are made up of a ball joint, a body, and a bushing as their main building blocks. The control arm body and the vehicle frame are connected via a ball joint and bushings on the wheel side of the vehicle suspension (often rubber bushings).
Of all the components involved with steering and suspension, a car's control arms are among the most expensive. These assemblies ultimately link a car's front wheels to the matching frame mounts. Control arms enable the frame itself to stay in a fixed position in addition to allowing the wheels of a vehicle to swivel up and down.