Bilstein 44-239985 Air Suspension Strut - Rear Left

Bilstein B4 OE Replacement Air Suspension Strut Overview

The Bilstein 44-239985 air suspension strut is engineered for precise fitment on Mercedes-Benz S550 and S550e models. Designed to restore original ride comfort and handling, this monotube air strut offers reliable performance with a durable black paint finish.

• Monotube internal design for consistent damping
• Black paint finish for corrosion resistance
• Lower mount type: Eye for secure attachment
• Upper mount type: Multiple studs for stable installation
• Boot not included
• Compatible with Mercedes-Benz S550 and S550e

About the B4 OE Replacement (Air) Product Line

The B4 OE Replacement (Air) series by Bilstein is developed to meet original equipment specifications for air suspension components. This product line focuses on delivering direct-fit air suspension struts that maintain factory ride quality and handling characteristics. The 44-239985 part number is part of this line, ensuring compatibility and performance aligned with Mercedes-Benz standards.

Product Details and Specifications

This Bilstein air suspension strut features a monotube internal design, which provides consistent damping and improved heat dissipation compared to twin-tube designs. The black paint finish offers protection against corrosion, extending the service life of the strut. The lower mount is an eye type, while the upper mount uses multiple studs, ensuring a secure and precise fit on the vehicle. Note that this strut does not include a protective boot.

Common Applications and Problem Solving

• Restores factory ride height and suspension performance on Mercedes-Benz S550 and S550e
• Addresses uneven or sagging suspension due to worn air struts
• Improves vehicle handling and stability compromised by faulty suspension components
• Eliminates air suspension warning lights caused by defective struts
• Replaces damaged or leaking air suspension struts to prevent further suspension system issues

Installation Notes and Tips

Ensure compatibility with Mercedes-Benz S550 or S550e before installation. The multiple stud upper mount and eye-type lower mount require proper alignment and torque specifications as per manufacturer guidelines. Since the boot is not included, inspect the existing boot for damage and replace if necessary to protect the strut. Professional installation is recommended to maintain suspension integrity and safety.

Quality Assurance and Warranty

Bilstein manufactures the 44-239985 air suspension strut to meet OE standards, ensuring reliable performance and durability. While specific warranty details are not provided here, Bilstein products typically come with a limited warranty covering defects in materials and workmanship. Verify warranty terms with the supplier or manufacturer for complete information.