What Are Control Arm Bushings and How Do They Work?

Does your vehicle have one or more worn control arm bushings? Automotive suspension consists of more than just shock or struts; they control arms as well. Within these control arms are vibration isolators known as bushings. When worn, control arm bushings may fail to absorb and isolate vibrations generated by your vehicle. For a better understanding of control arm bushings and how they work, keep reading.

What Are Control Arm Bushings?

Control arm bushings are cylindrical suspension components that are attached to control arms. While available in different styles, most control arm bushings consist of a sleeve with a soft rubber- or polyurethane-lined wall. 

They are known as "control arm bushings" because they are designed for use with control arms. Most automotive control arms come with bushings built into them. Over time, however, the bushings may wear down.

Control arm bushings are important for the following reasons:

• They absorb and isolate vibrations to promote a smoother driving experience.
• They minimize wear and tear to the other suspension components.
• They reduce noise.
• They improve fuel efficiency while subsequently saving you money at the pump.

How Control Arm Bushings Work

Control arm bushings work by preventing metal-on-metal friction with your vehicle's control arms. Control arms, of course, are suspension components that connect the wheels. A typical modern vehicle has two to four control arms. The control arms connect the wheels to the vehicle's framework. Within these suspension components are vibration isolators. Known as control arm bushings, they absorb and isolate vibrations.

Without bushings, the control arms would be exposed to severe wear and tear. After all, the control arms connect the wheels to the vehicle's framework. And driving with worn or damaged control arm bushings will expose the control arms to stress. Bushings protect the control arms by providing a cushioned point of connection for the wheels and framework.

Signs of Worm Control Arm Bushings

How do you know if your vehicle's control arm bushings need replacing? If your vehicle feels rougher or "bumpier" than usual, you should consider getting the suspension inspected. Worn control arm bushings will directly affect your vehicle's suspension. The suspension will struggle to absorb the shock of the road, resulting in a rougher driving experience.

You may hear unusual noises coming from your vehicle's undercarriage if the control arm bushings are bad. As the soft rubber- or polyurethane-lined wall begins to break down, you may hear a "clicking" or "popping" sound.