Now a days springs and shock absorbers can he the spring and shock absorbers mechanically or electrically controlled.
The suspension system also contains the following: 1. Control Arm It is an enviable lever that fastens steering knuckle to the frame or unitized body . 2. Steering Knuckle It provides support for wounding wheel hub bearing and wheel assembly. 3. Ball Joint It is also known as swivel joint. It allows control arm and steering Knuckle to move up and down. 4. Spring It supports weight of car. It also flexes to permit control arm and wheel to move up and down. 5. Shock Absorber It is also called damper. It prevents the suspension from continues bonnet after compression and extension of spring. 6. Control Arm Bushing It is a sleeve that allows control arm to swing up and down on the vehicle. 7. Strut Rod It fastens to the oater end of the lower control arm and to the frame. It does not allow the control arm to swing to ward the rear or front of the car. The front of the strut rod has rubber bushing, which softens the action of the strut rod. These bushings allow a controlled amount of lower control arm movement while allowing full suspension travel.