In an original car, there are at least four control arms connected to the frame and to the steering knuckles. With the help of this, the vehicle can be easily guided to corner and move according to the steering wheel’s direction. The tendency of the wagon to leave the ground during acceleration also gets reduced.
Also known as a wishbone or A-arm because of its nearly flat and rough triangular appearance, the control arm does the lower part of an independent suspension like the Macpherson. But in dual wishbone suspension, there are two A-arms in each wheel. The A-arm consists two parts-the lower or the broad arm and the upper or narrow arm. The lower end starched to connect to the vehicle’s frame and allows the A-arm to pivot on a bushing. The upper end, on the other side, connected to the steering knuckle and pivots on a ball joint.
Maintaining every control arm is easy. It only needs to be lubricated appropriately to ensure that its shaft points are working properly. Normally, problem in this component occurs with a smashed bushing or a worn ball joint. These are the parts that decline the fastest and can also precipitate. The wishbone’s wearing if not maintained properly. Sometimes, heavy load and erosive agents also take tolled on the A-arm. They cause breakage, nicks, cracks, and bending of the arm’s structure, which causes replacement of the arms. Changing a control arm may seem a bit difficult for the inexperienced, but it’s very simple enough to be done in a garage.