Bilstein 40-148359 Air Suspension Spring - Rear

Bilstein B3 OE Replacement Air Spring

The Bilstein B3 OE Replacement (Air) air suspension spring is built for direct replacement on select Mercedes-Benz rear suspension applications. It restores the original air spring connection and ride characteristics for drivers servicing a Mercedes-Benz R350, R320, R500, or R63 AMG with OE-style fitment.

Part number 40-148359 is part of Bilstein’s B3 OE Replacement (Air) line, a product range focused on direct-fit suspension air bags for European vehicles. This rear air suspension spring is finished in black paint and is engineered to connect to the factory system without modification.

Key Features

• Direct replacement air suspension spring for rear applications
• Black paint finish
• OE-style connector design for factory system integration
• Bilstein B3 OE Replacement (Air) series
• Part number 40-148359 for application matching
• Compatible with select Mercedes-Benz R-Class rear air suspension setups

Detailed Description

Bilstein 40-148359 is an OE replacement rear air suspension spring designed for select Mercedes-Benz vehicles, including the 2006-2012 Mercedes-Benz R350 rear, 2007-2009 Mercedes-Benz R320 rear, 2006-2007 Mercedes-Benz R500 rear, and 2007 Mercedes-Benz R63 AMG rear. It is intended to restore the original air suspension function and factory ride feel on these applications. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

The B3 OE Replacement (Air) line is built for direct installation into the original vehicle connectors, helping maintain the factory air suspension layout on Mercedes-Benz R-Class models. If you are searching for a rear air suspension spring for Mercedes-Benz R350, Mercedes-Benz R320, or Mercedes-Benz R500 applications, 40-148359 is the correct OE-style replacement to verify against your VIN and suspension configuration.

What It Helps Solve

• Rear suspension sag from a worn air spring
• Uneven ride height at the rear of the vehicle
• Air suspension leaks caused by aging rubber components
• Loss of factory ride quality on Mercedes-Benz R-Class models
• Warning lights or ride-height issues related to rear air suspension failure

Installation Notes and Tips

Confirm rear fitment before ordering and match part number 40-148359 to the vehicle’s original air spring configuration. This part is designed to connect directly to the factory connectors, so installation follows the original air suspension layout without modification. Verify the application against the vehicle’s year, model, and rear suspension setup before service.

Quality Assurance

Bilstein is an OE supplier for air suspension systems, and the B3 OE Replacement (Air) line is manufactured to meet the standards expected for factory-style replacement on European vehicles. The black paint finish and direct-fit design support consistent replacement quality for compatible Mercedes-Benz rear air suspension applications.