Bilstein B4 OE Replacement Air Suspension Strut - External Reservoir

 

Bilstein B4 OE Replacement Air Suspension Strut with external reservoir is built for customers who need an air suspension replacement that supports factory-style comfort and control. It combines the air spring and shock absorber functions into a module designed to restore the vehicle ride rather than change the suspension concept.

The external reservoir layout supports the selected air suspension application where additional packaging and damping requirements are part of the original-style design. For customers, the goal is a vehicle that sits correctly, responds predictably, and feels composed through daily driving and longer highway trips.

Air suspension repair is especially important on premium SUVs because ride height, damping, and load support work as a connected system. A worn module can affect body control, vehicle stance, comfort, and confidence, especially when passengers or cargo are added.

The B4 OE Replacement design focuses on restoring the intended experience with a clean black painted finish and monotube internal design. It is a practical option for customers who want the vehicle to feel closer to how it was designed to ride from the factory.

Fitment and position must be checked carefully because air suspension struts can vary by side, model, suspension package, and chassis details. The correct component helps preserve mounting alignment, air connection compatibility, and suspension behavior.

For customers repairing a daily driver, tow-capable SUV, or family vehicle, the right air suspension strut can restore comfort and stability. It helps the suspension carry load, manage motion, and maintain a level, controlled feel when the rest of the system is functioning properly.

Whether customers are upgrading for air suspension repair, highway comfort, family travel, and loaded SUV use, Bilstein B4 OE Replacement Air Suspension Strut delivers factory-style support with monotube damping and an external reservoir design. Now Available at LEER!

 

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Features & Specifications

Product Type: Air suspension strut

Brand: Bilstein

Series: B4 OE Replacement Air

Vehicle Fitment: Mercedes-Benz ML-Class applications

Finish: Black paint

Internal Design: Monotube

Reservoir: External reservoir

Segment: Air springs

Functionality:

• Restores air spring and damping function for compatible air suspension systems.
• Supports original-style ride quality rather than changing the suspension design.
• Helps address sagging, poor control, or worn air strut symptoms when properly diagnosed.
• Uses monotube damping for controlled suspension response.
• External reservoir design matches applications that require that layout.
• Supports load leveling behavior when the complete air system is operating properly.
• Provides a clean replacement finish for premium SUV suspension repair.

 

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Why Choose

This product is ideal for customers who want factory-style air suspension repair with external-reservoir packaging.

• Integrated air spring and damper function helps bring the vehicle back toward its intended ride.
• The external reservoir layout supports the selected application design.
• B4 OE Replacement tuning favors comfort, stability, and predictable daily use.
• Application-specific fitment helps maintain correct mounting and air connection behavior.
• A new replacement module can help restore confidence when old air suspension parts are worn.
• The black painted finish keeps the repair appearance clean and unobtrusive.
• The module supports customers who value original-style ride height and comfort.

 

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What's Included

• One Bilstein B4 OE Replacement air suspension strut with external reservoir for the selected application.
• Integrated air spring and monotube shock absorber module where supplied.
• Application-specific fittings or components where supplied.

Note: Confirm included components before installation.

 

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Installation Notes

• Confirm the selected part matches the vehicle, suspension package, and installation position.
• Inspect the full air suspension system for leaks or compressor issues before replacing components.
• Professional installation is recommended for air suspension service.
• Follow vehicle service procedures for ride-height checks or calibration when required.

Buyer is responsible for use in accordance with applicable vehicle, road, off-road, towing, racing, and local laws.

 

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Warranty Information

Warranty coverage is handled through Bilstein and may vary by product line, application, and installation conditions. Coverage typically requires proof of purchase and proper installation, and it commonly excludes damage from misuse, improper installation, modifications, overloading, tampering, impact damage outside warranty terms, or non-compliant use.