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Home Blog What Is A Suspension Control Arm, And Why Is It Important?

What Is A Suspension Control Arm, And Why Is It Important?

Control arms are a major component of a vehicle’s suspension system. They play an essential role in maintaining stability, control, and comfort. A control arm is a metal bar shaped somewhat like a triangle or wishbone that connects the suspension to the vehicle’s frame or body structure. One end attaches to the frame or body of the vehicle with bushings, and the other connects to the steering knuckle or wheel hub assembly with a ball joint. Control arms are found in the front and rear suspensions of most vehicles.

Why Do Control Arms Do?

It's common for vehicles to have an upper and a lower control arm for each front wheel, providing a sturdier connection and increased wheel control and stability. Control arms are a critical mounting point for a complex assembly of steering and suspension parts that include:

  • Bushings to absorb abrupt movement and vibration of parts
  • Joints for flexibility between connected suspension parts
  • Links that connect and control suspension movement at two separate points
  • Springs that dampen and optimize suspension movement under various road conditions.
  • Bearings for smooth, low-friction movement of rotating parts

Control arms work in unison with various suspension and steering components to do several important jobs. Primarily they:

  • Permit the wheels to travel up and down independently
  • Allow the front wheels to turn left or right in unison
  • Provide safe, smooth, and precise control of the vehicle under all conditions
  • Maintain optimal tire contact with the road for maximum traction and even tire wear

How Long Do Control Arms Last?

Control arms don’t have a specific replacement recommendation or expiration date. The longevity of control arms  can be affected by several factors, including:

  • Vehicle mileage
  • Vehicle age
  • Driving conditions
  • Operating climate 

The control arm construction can also impact longevity. Many vehicles use control arms that are manufactured through methods that focus soley on cost-effectiveness, creating an end product that can be more susceptible to corrosion over the life of the vehicle. Heavy-duty trucks often have forged steel control arms that can be less prone to corrosion. More expensive luxury and performance cars are likely equipped with cast aluminum control arms. Aluminum control arms are lighter weight, corrosion resistant, and will likely last the life of the vehicle. Toyota even offers TRD performance control arms for those who want to equip their vehicles for off-roading or overlanding. OEM control arms will:

  • Preserve OEM Suspension Geometry, Maximizing Performance On and Off-The-Road
  • Be Made From Machine Forged Aluminum For Incredible Strength
  • Offer a Lightweight Design to Deliver a Smoother Ride
  • For TRD Parts: Upgraded TRD Ball Joint Increases Durability
  • TRD Control Arms are the Same Upper/Lower Control Arms As Found In The TRD Pro Package

Since control arms are a critical mounting point for wear parts like rubber bushings and ball joints, periodic inspection is important to ensure safe vehicle operation. We have a large selection of durable OEM control arms for your Toyota vehicle. All our OEM parts are backed by the standard Toyota 12 month, unlimited miles warranty.

You Can Count On Olathe Toyota Parts Center 

We have a large selection of parts and accessories for your Toyota vehicle, including control arms. Here are some of our most popular control arms:

We are centrally located in Kansas City, which means we provide fast shipping to the east and west coasts. All our OEM parts are backed by the standard Toyota 12-month, unlimited miles warranty Do you have questions about finding the right control arms for your Toyota? We’re here to help. Please feel free to contact us!