Important components in the vehicle suspension system
Control arm connects to chassis and carries car wheel’s vertical suspension or articulated suspension linkage between wheel rims. The body is usually made up by thin metal plate such as stamped steel, cast aluminum, or cast iron so that it withstand the braking force created by spinning, and maintain chassis stability and stabilizes position of car wheels and shock absorber to reduce swaying when driving. This avoids unstable conditions to happen when driving.
Design: Double wishbone type, strut type, multi-link type, and trailing arm type, etc.
Reminder: When control arm is damaged, it will cause tires to wear out abnormally, and this will cause steering wheel to shake. When severe, it may cause tires to come off. When control arm bushing is damaged, there will be a sound of metals rubbing against each other.
Unless there is major impact force, control arm body does not break easily. Usually the part that is damaged is bushing. Therefore, in areas that have low labor cost, people will only change bushing. However, in areas that have high labor cost, they will change the entire control arm.