A1 Cardone 4J-4013S Air Suspension Strut Air suspension products are guaranteed to fit and function like the original, at a fraction of the typical market price Extensive rubber and performance testing ensures units are strong enough to withstand harsh temperatures and road conditions Products are endurance tested to last longer than 2 million cycles in their lifetime, as per international industry standards Designed with high-grade rubber to meet or exceed O.E.M. performance 100% tested to ensure long lasting reliable performance Periodically check condition of air strut bladders, air supply lines and air supply line connections for cracks, poor seals or any sign of deterioration. Check for any debris buildup around the air struts, supply lines or mounting brackets. If necessary, clean off debris with an unpressurized water source. Do not exceed the vehicles payload. Bouncy or choppy ride Sagging suspension Suspension bottoms out Air compressor runs continuously Yes, the replacement air strut will work with the vehicles air suspension electronic control system to automatically adjust suspension leveling and dampening as needed. Original Equipment (O.E.) air suspension struts are typically in operation up to 100,000 miles without issue; however, over time, the rubber bladder can dry out and begin to crack around the perimeter of the bladder, usually on the bottom. Once cracks form, its only a matter of time before a leak develops.