Select address
Select Your Vehicle
Go back to Blog

What Does a Rear Control Arm do?

Published by: Lucas
Date of Publish:

You must have a solid understanding of your vehicle's suspension and steering components since a malfunction in any device may have catastrophic consequences while driving. If your vehicle's suspension system is not functioning efficiently, prepare for an unpleasant ride. The worst thing that might happen to you while you're driving is the loss of vehicle control. You won't be able to drive your car if specific components of the suspension system are not in proper operating conditions.

Control arms are the core parts of a vehicle's suspension system. They are of different types: upper control arm, lower control arm, rear suspension, and many more. The control arms manage the vehicle's motion by connecting the suspension system to the chassis and helping them coordinate with the vehicle's body. They work in harmony with the bushings. The bushings are the cylindrical linings responsible for reducing friction.

This blog post has brought you valuable information about control arms, their role in a vehicle's suspension system, and much more. So stay tuned!

What Exactly Are Control Arms?

The control arms of your suspension system are the essential component. For a better understanding, control arms are the connection that links your car's wheels to the rest of the vehicle. Your vehicle's wheel assembly is connected to one end of this cable, and the structure of your car is connected to the other.

The upper and lower control arms then join the vehicle's chassis, with the upper arm connecting to the region of the wheel at the very top and the lower arm connecting to the part of the wheel at the bottom. The design is the same whether or not the vehicle has an independent rear suspension.

The control arms ate believed to have a good life, i.e., up to 100,100 miles. However, they degenerate, bend and wear out over a considerable period. This can be reduced in case of severe accidents where they can instantly brake because of the trauma.

Rear Control Arm and What Does It Do?

The component called the rear control arm is a vital part of the suspension system of your vehicle. A vehicle's suspension system is of great significance. The upper differential housing is where the rear control arm connects to the body. It supports the movement of the axles, i.e., up and down. Lower control arms transmit the force from the wheels to the chassis.

Significance of a Rear Control Arm

Would you dare enough to drive with a broken rear control arm? Not! No sane person would pop in the car and get going because he must know how dangerous this practice could be. A broken control arm means lesser weight support. This can compromise the vehicle's stability. This is a great statement when describing a car's health in relevance to the rear control arm and justifies the importance of this component. A sound and healthy rear control arm ensure safe and swift drive, which is why it can be ranked as one of the most important parts of a vehicle.

Besides the safe drive, the control arm is vital because it links the suspension system to the vehicle's body.

What Happens If the Control Arm Breaks While Driving?

The rear control arm has cylindrical bushings on its interior, which acts as a shock absorber on rough and bumpy roads. If your rear control arm breaks while driving, it can result in continuous vibrations. At the same time, the metallic sleeves of the arm rattle a lot, which makes the front wheels sound annoying. When the rear control arm becomes incapable, annoying clucking sounds and vibrations may arise.

How do the Control Arms Works?

What is the precise role of the rear control arm in a vehicle? This control arm carries out many tasks.

#1 It Provides the Link between the Wheel and the Frame

The control arm of a vehicle has various functions, one of which is to link the wheel to the vehicle's chassis, increasing the vehicle's stability. It makes biking over uneven terrain more pleasant. Synchronizing the wheel motions with the frame movements also plays a significant role in decreasing vehicle vibrations. It is simpler for them to do this task since it has jointed edges.

#2 It Facilitates Vehicle's Maneuverability

The control arm helps the driver steer a vehicle by twisting the steering wheel at the ball joint while the vehicle is being driven. This offers the driver more control over the vehicle's direction. It helps move the vehicle up or down while preserving its stability and maintaining constant touch with the ground. In this case, you will be unable to detect road imperfections.

In the process of making a vehicle easy to operate and pleasurable to ride, the lower and upper control arms perform roles that are comparable to one another.

Signs that a Rear Lower Control Arm is Falling Apart


Constant vibrations in your car are of greater consequence. If the vehicle begins to tremble, you should not merely observe it in awe. Deal with the problem as quickly as feasible. In case the well-being of your vehicle's rear control arm is compromised, you will experience vibrations during the ride. You may notice the wheels trembling, not working harmoniously, and being affected by vibrations. Shaking and vibrating may not first seem like problems of a magnitude, but as they persist, they will only grow and become a significant irritation and nuisance.


Strange noises are always unpleasant and irritating. Pay close attention to any peculiar noises in your vehicle that you may notice. Take action before the strange sounds become much more bothersome. Your vehicle has various components, each capable of producing unique and distinguished sound. There is a good chance that you may hear a banging sound from your vehicle's rear control arm if it fails. It undoubtedly is a source of frustration, but the good part is the awareness you just got after reading this because we are afraid you would have mustered trouble before knowing the facts. So, stay positive, informed, and hope for the least to happen. If you experience shrill and annoying sounds getting more prominent, these may indicate a breaking control arm, so rush to the nearest mechanic.


The act of pulling produces an unusual feeling. This condition is called a pull when your vehicle begins to veer to the right or left direction while driving. It's a strange feeling to experience. The most common cause of these problems is uneven wear on the tires or the vehicle's compromised alignment, which should be quickly fixed. Both problems may be solved by having your vehicle's alignment fixed. However, another case when your vehicle may start to veer to one side is when the rear control arm has been damaged and has to be replaced. As far as driving is concerned, having enough control over the steering wheel is mandatory. When driving your automobile, you should take these indications seriously if the vehicle doesn't seem like a galloping horse and does not stay aligned and follow the driver's directions and maneuvering. You will notice the steering wandering around.

Tires That Wear Unevenly

Your wheels may be incorrectly aligned if your front or rear control arm is faulty. If not addressed, it might lead to uneven wear on your tires and perhaps an accident. It is always a clever move to conduct a visual inspection of your tires regularly so that you can sense the problems timely, sort them out and avoid massive troubles. The good part is that the wear is visible and can be easily identified.

For more, please refer to How much does control arm replacement cost, What is the lower control arm in a car, and What is a faulty lower control arm on a car

Replacement and Cost of the Rear Control Arm

The control arms are believed to work in synchronization. In case your rear control arm has turned bad or is broken, replacement is the only solution. However, it is also believed that as both arms work simultaneously, it is more obvious that if one of them is broken, the other will soon give up. Therefore, replacing both arms is recommended instead of replacing the single broken rear control arm. This tip will save you from unnecessary trips to the mechanic's place and help you save some. The replacement will cost you a considerable amount. It's better to calculate the service charges and taxes as well. So, plan the replacement according to a meaningful plan.


A rear control arm is a suspension component that connects and attaches to the vehicle's frame and axle. The vehicle's rear control arm must work correctly. It is also a safety element since it prevents loss of vehicle control. The vehicle might become unstable and difficult to drive if a control arm is injured or fails, leading to an accident. If the rear control arm is broken, you will experience clear signs and symptoms like noise, pulling, and vibrations. These can be easily replaced but charges you a good amount, so be a handful when approaching a mechanic.

About A-Premium
Learn more about what makes A-
Premium a brand you can rely on.
Our Story