The 2004-2011 Infiniti QX56 is built with the following suspension components:
2004-2011 Infiniti QX56 Rear Air Shocks (x2) - A rubber bladder atop the shock itself fills with air to automatically to keep the vehicle level and to assist with the ride quality. The rubber portion of the air shock is the most common cause for leaks in the air system. The rubber portion develops cracks due to normal wear and tear and dry rot from exposure to the elements. The cracks leak air from the system and cause the onboard compressor to work overtime.
2004-2011 Infiniti QX56 Ride Height Sensors (x2) - a linkage located near each wheel that constantly measures the height of the vehicle and reports this information back to the control module (computer). The ride height sensor is a moving part and they will eventually wear out.
2004-2011 Infiniti QX56 Front Coil-over Struts (x2) - Metal tubing filled with gas-charged hydraulic fluid (similar to a shock absorber) that is connected to the wheel of a vehicle in order to reduce bouncing motion and vibration caused by travel on rough surfaces. Coil-over struts have a coil spring seated at the top which controls the height of the vehicle. Over time, the fluids leak out of the struts from millions of up and down cycles and they need to replace. Coil springs can become weakened on a high mileage vehicle, too.
2004-2011 Infiniti QX56 Air Lines- Tubes that carry pressurized air to the rubber bladder in the air shocks.
2004-2015 Infiniti QX56 Air Compressor Assembly- Creates and sends pressurized air to the rear air shocks. When the air suspension starts leaking, the compressor (also known as an air pump) starts working harder to try to keep the system inflated. By the time air suspension leaks down completely, the compressor will either have failed totally or it will still run, but no longer be able to make enough air to do the job.
2004-2011 Infiniti QX56 Dryer- Prevents moisture build-up inside of air suspension parts.
2004-2015 Infiniti QX56 Suspension Control Module- A computer responsible for the operations of the air suspension system and maintaining the vehicle's correct ride height.