Types of Suspension

Conventional Front Suspension:
In a conventional front suspension, the wheel is attached to a spindle, which in turn is connected to upper and lower control arms through upper and lower ball joints. The vehicle’s coil spring works against one of the control arms to support the weight of the vehicle, and the shock absorber controls spring oscillations.

Rear Suspension:
All rear suspension systems are designed to keep the rear axle and wheels in their proper position under the vehicle body. The rear wheels must always track exactly straight ahead. The rear suspension axle allows each of the rear wheels to move up and down somewhat independently from the frame. The spring assembly must also absorb a large amount of rear end torque from acceleration (on rear drive vehicles), side thrust from turning and road shock from bumps.

MacPherson Strut Suspension:
In a strut suspension, the strut assembly usually contains a spring seat to retain the coil spring that supports the weight of the vehicle. The strut is attached at the bottom to the lower control arm and at the top to the vehicle body. The upper connection usually contains a bearing that permits the coil spring to rotate as the wheels turn, for smoother steering.

The strut suspension has eliminated the need for several parts, including the upper control arm and the upper ball joint. This has several advantages including lighter suspension weight, fewer moving parts and more room in the engine compartment.