Bilstein 40-221595 Air Suspension Spring - Rear

Bilstein B3 OE Replacement Air Spring

Restore factory ride height and rear suspension performance with the Bilstein B3 OE Replacement (Air) air suspension spring. Built for select BMW X5 and BMW X6 applications, this rear air bag is made to connect directly to the original vehicle connectors for a modification-free replacement.

Bilstein’s B3 OE Replacement (Air) line focuses on direct-fit suspension restoration for European vehicles, using OE-level design and manufacturing standards to match the original air suspension setup.

Key Features

• OE-style rear air suspension spring for select BMW models
• Direct connection to original factory connectors
• Designed to restore original suspension feel and ride height
• Built for BMW X5 and BMW X6 rear self-leveling suspension applications
• Bilstein B3 OE Replacement (Air) series
• Part number 40-221595 for application matching and catalog lookup

Detailed Description

Bilstein 40-221595 is an air suspension spring for the rear of select 2007-2013 BMW X5 and 2008-2014 BMW X6 models equipped with self-leveling suspension. It is engineered as an OE replacement air bag that installs through the factory connection points, helping return the suspension system to its original operating characteristics. For BMW X5 and BMW X6 owners searching for a rear air suspension spring replacement, Bilstein 40-221595 provides a direct-fit solution aligned with the original equipment layout.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Rear end sagging from a worn air spring
• Uneven ride height on self-leveling suspension systems
• Air suspension leaks at the spring assembly
• Loss of factory ride comfort and load-leveling performance
• Warning lights or suspension faults related to rear air spring failure

Installation Notes

Fits 2008-2014 BMW X6, rear, with self-leveling suspension. Fits 2007-2013 BMW X5, rear, with self-leveling suspension. Verify the vehicle’s suspension configuration and connector style before installation. This part is designed to connect directly to the original connectors, supporting a factory-style replacement process without modification.

Quality Assurance

Bilstein is an OE supplier for air suspension systems, and the B3 OE Replacement (Air) line is built to meet the standards expected for original-equipment replacement on select European vehicles. Part number 40-221595 is engineered for direct-fit restoration on the listed BMW X5 and BMW X6 rear applications.