A lower control arm is an essential part of your vehicle’s suspension system. It connects the chassis to the wheel hub, allowing for smooth wheel movement. This component absorbs the forces of acceleration, braking, and cornering, contributing to vehicle stability. Without a properly functioning lower control arms, driving becomes unsafe due to increased wear on tires and the potential for steering issues.
What Does Lower Control Arm Do?
A lower control arm is a vital suspension component found in most modern vehicles.
It connects the vehicle’s frame or subframe to the steering knuckle or wheel hub, allowing the wheels to move up and down smoothly while maintaining proper alignment.
This part is essential for vehicle handling and comfort, as it absorbs the shocks from the road and keeps the wheels aligned with the body of the car.
Typically, there are two lower control arms in each vehicle, one on either side of the front suspension.
They work together with the upper control arms to maintain stability during turns, acceleration, and braking.
How Long Do Lower Control Arms Last?
The lifespan of lower control arms depends on several factors, including the vehicle’s make, driving conditions, and maintenance.
On average, a well-maintained lower control arm can last anywhere from 100,000 to 150,000 miles.
However, harsh driving conditions such as rough roads, off-roading, or frequent potholes can accelerate wear and tear.
It’s also important to check the condition of the associated bushings and ball joints. These parts wear out faster than the control arms themselves and can affect the performance of the suspension system.
Suppose you regularly drive in challenging conditions or notice strange noises or vibrations while driving. In that case, it’s a good idea to have the lower control arms and its components inspected earlier than the recommended mileage.
When to Replace Lower Control Arm?
There are several signs that indicate it’s time to replace the lower control arms. Here are the most common:
Vibrations or Steering Instability
If you feel a continuous vibration through the steering wheel, especially at higher speeds, or notice difficulty steering, it could be due to a worn-out lower control arm or its bushings.
Uneven Tire Wear
A damaged lower control arm can disrupt wheel alignment, causing tires to wear unevenly or excessively. If you notice one-sided wear or bald spots on your tires, it’s a good idea to check your suspension system.
Clunking or Knocking Sounds
If you hear clunking or knocking sounds when driving over bumps, it could indicate that the lower control arms or its components (like the bushings or ball joints) are damaged.
Loose or Worn Bushings
Control arms rely on rubber bushings to absorb shocks and reduce vibrations. If these bushings are worn or cracked, it can lead to instability in the suspension and steering.
If any of these symptoms are present, it’s essential to have the lower control arm checked by a professional. Continuing to drive with a faulty control arm can result in further damage to your vehicle’s suspension system and even compromise your safety.
How to Replace Lower Control Arm?
Replacing a lower control arm can be a complex job, but it’s doable with the right tools and know-how. Here’s a general guide on how to do it:
Lift the Vehicle
Use a jack to lift the vehicle off the ground, ensuring it’s securely supported with jack stands. This allows you to access the suspension components.
Remove the Wheel
After lifting the vehicle, remove the wheel to expose the suspension components.
Disconnect the Control Arm
You’ll need to remove the bolts that connect the lower control arm to the chassis and the steering knuckle. This may require some force, as the bolts can be rusted or seized.
Replace the Control Arm
Once the old control arm is removed, position the new one in place. Secure it by tightening the bolts. Ensure the alignment is correct before tightening everything completely.
Reassemble and Test Drive
Once the control arms have been replaced, secure the wheel, lower the vehicle, and ensure the lug nuts are properly tightened. Take the car for a test drive to confirm smooth handling and check for any unusual sounds or vibrations.
If you’re unsure about any part of the process, it’s always best to consult a professional mechanic. Additionally, replacing a lower control arm can be expensive, with costs ranging from $20 to $50 for the part itself, plus labor charges of $150 to $200.
