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You might not think about all the parts that make riding in a car nice and smooth. A critical component of your vehicle’s suspension system is your upper and lower control arms. These arms are similar to the arms on a robot: They help to hold your car’s wheels where they need to be when you drive.
The upper control arm is connected with the top of the wheel and lower control arm is connected with the bottom. Between the two, they share the work of holding up the car and handling road bumps. Your car would ride like a roller coaster if you didn't have these control arms!
Next up we will discuss ball joints. Ball joints are similar to the joints in your body that allow you to pivot your arms and legs. In a car, ball joints attach the front, upper and lower control arms (of a wheel assembly) to the steering knuckle. They allow the control arms to move up and down while keeping the wheels aligned.
Ball joints are significant as they carry the weight of the car and are essential in steering properly. Ball joints will wear over time as they get used a lot and get dirty. Maintain your ball joints by inspecting them and swapping them out if they appear old.
So, how do you know whether it’s time to replace your ball joints? One is a clunking sound you can hear from your wheels when you ride over bumps. This indicates that the ball joints could be loose and not have enough support to hold the car up.
Another indication is irregular ware on the tires. If one side's tires wear out more quickly than the other's, the problem might be due to a ball joint that's no longer working properly. If you see these signs, have a mechanic examine your ball joints and replace them if necessary.
The upper control arm plays a role in controlling the camber angle of the wheels, i.e., the ones that wheels angle when viewed from the front or back of the car. The lower control arm contributes to the caster angle, which determines the angle the wheels tilt when viewed from the side of the car.
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