Control arms are connected to the frame or body of a car through flexible rubber bushings, calledcontrol arm bushings. This allows a control arm to swing up and down as front wheels roll over bumps and potholes. The outer end of a control arm has aball joint. In some cars, aball joint...
doing brake work or other undercar work such as changing the oil. Look for grease on the outisde of the boot, or on the inside of wheel or nearby suspension components (struts, contrl arms, steering knuckle, tie rods, etc.).