The control and smoothness of your vehicle is function of your car’s suspension system. The suspension system eases the impact of road deformities or potholes not only to the car but also the occupants. 
The control arms are responsible for the controlled up & down movement of the tires. Significant number of front-wheel-drive cars use lower control arm only, while larger vehicles like SUVs (sports utility vehicle) & Trucks usually have both the control arms upper as well as lower. 
The control arm connects the wheel hub and steering knuckle to the frame of the car or vehicle. Vehicle suspension systems increases the connect or friction between the tires and road and this increased friction leads to better steering stability and control. 
Suspension system comprises of the wheel, springs, shock absorbers and few other which increase the connect between tire and road. The control arm or as famously known as A-arm as well, is a key part of the suspension system which connects car frame and the front wheel hubs. 

Benefits of Control Arms 

1. Smooth Ride 
2. Better control 

Signs of Worn Out Control Arms 

1. Bumpy Rides 
2. Metal Clanking Sounds 
3. Uneven tire wear out Steering issues 

The child parts ball joint and bushings are fixed on the either ends of a control arm. 

Its control arms primary function to control and guide the up & down function of the tire and ensure due steering control. 
Lets now look at the location of the control arm its located in the front wheels, the upper control arms are attached to the top part and the lower control arms connects at bottom part of the wheel. Both control arms care connected to the car’s front frame with the 2 bushings which allows the control arm to move up and down and reduce the noise, control vibration by preventing the metals contact with each other on these parts. 
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