It is important to understand air suspensions because there is a direct interaction between the air suspension and the leveling of a vehicle. In fact, there are leveling systems available that use the vehicle air suspension to do the leveling. The HWH Active Air system actually controls the air suspension of a vehicle while the vehicle is traveling. You must understand the air suspension before dealing with our systems that are installed on vehicles with an air suspension. At this time it is important to note that the following discussions are generic in nature. There are many different types and manufacturers of air suspensions and many different ways they are put together. Even different chassis’s built by the same manufacturer can be different in some ways. There are different air bag, air tank and valve arrangements. When dealing with suspension issues, it is critical that you obtain plumbing and wiring diagrams for the specific chassis that you are working on. Suspension is the term given to the system of springs, shock absorbers and linkages that connects a vehicle to its wheels. Suspension systems serve a dual purpose — contributing to the car's road holding handling and braking for good active safety and driving pleasure, and keeping vehicle occupants comfortable and reasonably well isolated from road noise, bumps, and vibrations, etc. These goals are generally at odds, so the tuning of suspensions involves finding the right compromise. It is important for the suspension to keep the road wheel in contact with the road surface as much as possible, because all the forces acting on the vehicle do so through the contact patches of the tires. The suspension also protects the vehicle itself and any cargo or luggage from damage and wear. The design of front and rear suspension of a car may be different.