My Talks with you about Air Bag Suspension

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What is Air Bag Suspension?

It has been around for many years - in fact some manufacturers have been using it since the very first vehicles were designed. In your car, the air suspension is powered by an electric air pump or compressor. The pump pressurises the air, using compressed air as a spring - allowing the car to sit higher or lower from the ground. If the engine is left off for a certain period of time, the car will settle closer to the ground.

It is designed to keep your vehicle smooth and level when you are driving. For example, when driving an older can you may notice that the car vibrates or "bounces" more, and in a newer car, the drive will feel smoother, even when you drive over uneven roads.

One type is an air strut. Air struts are generally designed to be used in late-model vehicles that run a coil spring over the shock absorber.

Another type is the more common two or three-layer convoluted rubber bag, similar to what you see under the back of many trucks to help in carrying heavy loads.

You can think of it as working similar to a spring that absorbs pressure and movement as you are driving. So like a spring, the more air there is in the airbag, the higher the car will be, and the lower the pressure in the airbag, the lower the vehicle will be.

When you are driving, the airbags are inflated by small air compressors. The amount of air that they release is determined by the vehicles weight and the suspension design, and a special pressure switch will tell the compressor when to start and stop filling the airbags.

Adjustable pressure switches are available, but most people will choose to run fixed-pressure 100/180psi switches or similar. So if the pressure drops to 100psi the compressor will start, and will stop when 180psi is reached.