Strut Rods and Caster
The strut rod is connected between the frame and the lower control arm. It controls its forward and backward movement. This is why worn and corroded strut rod bushings result in a clunking noise while braking. Most vehicles have positive caster for greater stability and wheel return. When the bushings fail, the caster angle will be affected. Many manufacturers use a drag link instead, which functions just like a strut rod but is located in front of the lower control arm. It pulls on the arm instead of compressing it. Some manufacturers call the strut rod a compression rod.