Bilstein 21-031144 Suspension Strut Cartridge - Front

Bilstein B4 OE Replacement Suspension Strut Cartridge Overview

The Bilstein shock absorbers part number 21-031144 is designed specifically for BMW 735i, 735iL, 740i, 740iL, and 750iL models. This suspension strut cartridge offers a reliable twintube internal design with a black paint finish, engineered to restore original ride comfort and handling characteristics.

• Compatible with BMW 735i, 735iL, 740i, 740iL, and 750iL
• Part number 21-031144 for precise fitment
• Twintube internal design for consistent damping
• Black paint finish for corrosion resistance
• Special lower mount and stem upper mount types
• Boot not included

About the B4 OE Replacement Product Line

The Bilstein B4 OE Replacement line is engineered to meet or exceed original equipment specifications. This product line focuses on restoring the original driving dynamics and comfort of your vehicle by using OE-style components and designs. The B4 series is ideal for drivers seeking a direct replacement that maintains factory performance without modification.

Product Details and Features

This Bilstein suspension strut cartridge features a twintube internal design, which provides reliable and consistent damping performance suitable for daily driving conditions. The black paint finish offers protection against corrosion, extending the service life of the strut. The special lower mount type and stem upper mount type ensure proper fitment and secure installation on compatible BMW models. Note that this strut cartridge does not include a boot.

Common Applications and Problem Solving

• Restores original ride comfort and handling on BMW 735i, 735iL, 740i, 740iL, and 750iL
• Replaces worn or leaking suspension struts causing poor vehicle stability
• Eliminates excessive body roll and uneven tire wear
• Addresses noise and vibration issues related to faulty strut cartridges
• Improves overall suspension response and road feedback

Installation Notes and Tips

Ensure compatibility with your specific BMW model before installation. The special lower mount and stem upper mount require proper alignment and torque specifications during installation. It is recommended to have suspension components inspected and replaced in pairs to maintain balanced handling. Professional installation is advised to ensure safety and optimal performance.

Quality Assurance and Warranty

Bilstein B4 OE Replacement shock absorbers are manufactured to meet original equipment standards, providing consistent quality and durability. While specific warranty details are not provided here, Bilstein products typically come with manufacturer-backed warranties covering defects in materials and workmanship. Refer to official Bilstein documentation for exact warranty terms.