Audi A4 Control Arms, Suspension Rods & Parts

A control arm's function is to control the motion of the wheels. Guiding your Audi A4 through a corner, you feel the centrifugal force attempting to relocate your body in the opposite direction. The same force acts on the wheels aiming to tear them off the vehicle. Control arms and wishbones are what the independent suspension setup uses to prevent that from happening. The difference between the two is that control arms form a two-link connection, thus being unable to counter any longitudinal motion, whereas the wishbones attach at three points, eliminating the necessity for extra linkage.

You’re unlikely to have any problems with your Audi A4’s control arms themselves because they are plain steel rods. The reason why you need replacements is that these rods have ball joints and bushings that are highly susceptible to wear. And whereas the latter can be changed independently, the former requires the replacement of the entire part. Control arm bushings are subjected to high pressure under braking or heavy acceleration, and these strong forces cause the bushings to crack. It is a known issue in Audi A4 cars. In our Audi A4 control arms & components catalog, we’ve gathered a full selection of high-quality aftermarket parts that are priced more competitively than the original equipment while offering high reliability and strength.