BMW Air Strut (E65 E66) - Bilstein B4 Air 44-262259

Product Information

An air suspension strut is a key component in vehicles equipped with air suspension systems. It combines a traditional shock absorber with an air spring (a rubber bladder filled with pressurized air). The strut supports the vehicle’s weight, absorbs road impacts, and adjusts ride height for comfort and handling. Over time, the air bladder, seals, or internal shock can wear out, leading to ride and handling issues.

• Sagging or uneven ride height – one corner or the entire vehicle sits lower than normal.
• Rough or bouncy ride – poor damping from a worn shock or air bladder leak.
• Air compressor overuse – system runs constantly to compensate for air leaks in the strut.

About Bilstein B4 Air

Bilstein B4 OE Replacement Air modules, airbags, and gas pressure shock absorbers are designed to replace the original air suspension systems on many Mercedes-Benz and Jaguars. As Bilstein is the OE supplier for these items, you can rest assured that the quality of these products meets, and typically exceeds, the standards set forth by the vehicle's manufacturer. Each B4 Air product is designed to connect directly into the original plugs on the vehicle, ensuring modification-free installation and restoration of the original feel of the vehicle.

Built and tested to OE quality standards

• Direct fit original equipment
• Maintains the active factory system to ensure predictable handling, safe stopping distances, and original ride comfort
• Made in Germany and the USA
• Easy installation with Bilstein service and support