A control arm, also known as an A-arm or wishbone, is a vital part of a vehicle’s suspension system that connects the wheels to the vehicle’s frame:
- Function
Control arms allow the wheels to move up and down while remaining in contact with the road, which is essential for stability and safety. They also help to keep the wheels aligned and reduce friction and vibration when steering.
- Parts
Control arms are made up of three main parts: a bushing, body, and ball joint. The body connects to the vehicle frame via the bushings, and the ball joint connects to the wheel side of the vehicle suspension.
- Number
Most modern cars only have control arms in the front wheel suspension, but larger or heavy-duty vehicles may have control arms in the rear axle.
- Signs of a failing control armSigns of a failing control arm include a popping noise, unstable steering, and uneven tire wear.
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