Air suspension
Air suspension is a type of vehicle suspension powered by an electric or engine-driven air pump or compressor. This compressor pumps the air into a flexible bellows, usually made from textile-reinforced rubber. Unlike hydro pneumatic suspension, which offers many similar features, air suspension does not use pressurized liquid, but pressurized air. The air pressure inflates the bellows, and raises the chassis from the axle.

Auto Parts Air Struts

A strut is a major structural part of a suspension. It takes the place of the upper control arm and upper ball joint used in conventional suspensions. Because of its design, a strut is lighter and takes up less space than the shock absorbers in conventional suspension systems.
A struts perform two main jobs. First, struts perform a damping function. A piston is attached to the end of the piston rod and works against hydraulic fluid to control spring and suspension movement. Just like shock absorbers, the valving generates resistance to forces created by the up and down motion of the suspension. Also like shock absorbers, a strut is velocity sensitive, so that the amount of resistance can increase or decrease depending on how fast the suspension moves.
A struts also perform a second job. Unlike shock absorbers, struts provide structural support for the vehicle suspension, support the spring, and hold the tire in an aligned position. Additionally, they bear much of the side load placed on the vehicle's suspension. As a result, struts affect riding comfort and handling as well as vehicle control, braking, steering, wheel alignment and wear on other suspension.

Air Spring
Air springs or air bags are a rubber spring that will be paired with a traditional shock. An air spring will typically be found on the rear of larger vehicles like Lincoln SUVs and RAM trucks. Air springs are very strong for their size and when they are at higher pressures, they can support a respectable amount of weight.

Valves
Valves on OEM air suspensions are computer-controlled to move air around the system as the computer deems necessary. A solenoid valve can be electrically opened or closed to allow or restrict flow to certain parts of the system.

Components of the air suspension system
An air suspension system generally has three basic components. They are air supply, the air bags and the height control valves. Drier, Air Pump, Control Module, Air Line, Height Sensor, Suspension air bag, Solenoid