-6%
Click to zoom in
SKU: 44-400187 | UPC: 840123520029
Bilstein B4 OE Replacement (Air) Monotube Strut - Rear Left 2021+ Mercedes-Benz S500/S580/S580e
The Bilstein 44-400187 B4 OE Replacement (Air) Monotube Strut is the best direct replacement for the rear left air suspension strut on 2021+ Mercedes-Benz S500, S580, and S580e models. As an OE supplier for air suspension systems, Bilstein B4 dampers meet and exceed the original equipment standards, restoring 100% factory functionality and ride quality. Manufactured with 100% new parts for maximum reliability and safety, these monotube struts connect directly into the original connectors for modification-free installation, ensuring the original feel of the vehicle is fully restored.
Key Features
- Restores Original Functionality 100%: Exact match to factory performance and ride quality
- Manufactured with 100% New Parts: Maximum reliability and safety
- 100% OE Quality and Comfort: Meets and exceeds original equipment standards
- Direct Fit Installation: Connects directly into original connectors with no modifications required
- Monotube Design: Superior damping control and heat dissipation
- Bilstein Quality: German engineered and OE supplier for Mercedes-Benz air suspension
Specifications
| Specification | Detail |
|---|---|
| Part Number | 44-400187 |
| Position | Rear Left |
| Type | B4 OE Replacement (Air) Monotube Strut |
| Compatibility | 2021+ Mercedes-Benz S500, S580, S580e with Air Suspension (without E-Active Suspension, without 4-Wheel Steering) |
| Installation | Direct Replacement |
| Country of Origin | Germany |
| Warranty | Limited (Bilstein) |
| Shipping Weight | Approx. 15 to 20 lbs |
What's Included
- One Rear Left B4 OE Replacement (Air) Monotube Strut
Product Notes
- Specifically for vehicles equipped with air suspension
- Restores factory ride quality and handling
- Direct plug-and-play replacement for original air strut
Installation Notes
- Estimated time: 2 to 4 hours, moderate to advanced difficulty, professional installation highly recommended
- Direct replacement using factory connectors and mounting points
- Professional alignment and system calibration recommended after installation
This Part Fits
| Year | Make | Model | Notes |
|---|---|---|---|
| 2021 to 2025 | Mercedes-Benz | S500 4Matic | L6.2999cc - Without E-Active Suspension, Without 4-Wheel Steering, With Air Suspension |
| 2021 to 2025 | Mercedes-Benz | S580 4Matic | V8.3982cc - Without E-Active Suspension, Without 4-Wheel Steering, With Air Suspension |
| 2023 to 2025 | Mercedes-Benz | S580e 4Matic | L6.2999cc - Without E-Active Suspension, Without 4-Wheel Steering, With Air Suspension |
Why Choose Bilstein B4 OE Replacement Air Strut?
- Exact OE replacement restores 100% factory functionality and ride quality
- 100% new parts for maximum reliability and safety
- Direct plug-and-play installation with original connectors
Frequently Asked Questions
-
Q: Will this strut fit my 2022 Mercedes-Benz S580 with air suspension?
A: Yes, Bilstein 44-400187 fits 2021+ Mercedes-Benz S-Class models with air suspension (without E-Active Suspension and without 4-Wheel Steering). -
Q: Is this the left or right side?
A: This is the Rear Left strut. -
Q: Does it include the air spring?
A: Yes, this is a complete OE replacement air strut module. -
Q: What is the warranty?
A: Covered by Bilstein limited warranty built for performance.
Shipping & Handling
- Method: UPS / FedEx Ground
- Availability: In stock ships same or next business day
- Packaging: Secure protective packaging
- Weight: Approx. 15 to 20 lbs
Bilstein
Shop Bilstein shocks and suspension at Black Ops Auto Works for monotube shock absorbers, struts, B4 OE replacement shocks, B6 performance shocks, B8 5100 ride-height adjustable shocks, B8 6112 suspension kits, B8 8112 coilover-style shocks, B12 suspension kits, B14 coilovers, B16 suspension systems, steering dampers, suspension hardware, and performance suspension components. Bilstein is trusted by enthusiasts, truck owners, off-road drivers, and performance vehicle owners who want better ride control, handling, stability, and durability. Use this Bilstein collection to choose the right suspension upgrade by vehicle platform, driving style, lift height, and performance goal. Bilstein B4 products are useful for OE-style replacement, B6 shocks support improved performance on factory-height vehicles, B8 5100 shocks are popular for trucks and SUVs with leveling or lift setups, B8 6112 and B8 8112 systems support more serious off-road and ride-height needs, and B14 or B16 kits support p...
View Bilstein Products
Shocks and Struts
Shop shocks and struts at Black Ops Auto Works for improved ride control, handling, stability, comfort, towing support, off-road performance, and suspension replacement. This collection includes shock absorbers, monotube shocks, gas shocks, hydraulic shocks, strut assemblies, front struts, rear shocks, coil-over shocks, reservoir shocks, steering dampers, suspension hardware, and vehicle-specific dampers for cars, trucks, SUVs, Jeeps, off-road builds, and performance vehicles. Use this Shocks and Struts collection to find the right suspension upgrade by vehicle, ride height, driving style, and product type. Replacement shocks and struts help restore ride quality, performance shocks improve control and stability, heavy-duty truck shocks support larger vehicles and lifted setups, and off-road shocks help improve durability and control on rough terrain. Shop Shocks and Struts by Brand Black Ops Auto Works carries shocks, struts, and suspension dampers from trusted brands including Bils...
View Shocks and Struts Products
Suspension
Aftermarket suspension systems improve handling, ride quality, and ride height adjustment beyond what the factory suspension provides. From lowering springs and coilover kits for sport handling to lift kits and leveling kits for truck and SUV off-road capability, quality suspension components transform how a vehicle rides and handles. Popular Suspension Upgrades Popular suspension upgrades include coilover kits for adjustable ride height and damping, sport lowering springs for improved handling and reduced body roll, performance shock absorbers and strut assemblies, sway bar and end link upgrade kits, subframe brace kits, and complete suspension packages for lifted trucks and off-road SUVs. Alignment kits including camber bolts and camber arms are also frequently ordered after ride height changes. What is the difference between coilovers and lowering springs? Coilovers are complete shock and spring assemblies with adjustable ride height set by threading the spring perch on the shock...
View Suspension ProductsLet customers speak for us
Looks pretty nice
Looks pretty nice, pricing was good and the reinforcement is a big plus.
Randy H.
Black Ops Auto Works
I emailed customer service to inquire about when it would be shipped
I emailed customer service to inquire about when it would be shipped. They checked and emailed me with the answer. Customer service is A1
Ralph J.
Black Ops Auto Works
Installation was easy
Installation was easy. The price is good and it looks great on the truck.
Ralph J.
RHO Small Grille Badge
Looks as good as it fits
Looks as good as it fits,
zachary d.
Seibon 70-73 Datsun 240Z OE Carbon Fiber Hood
Nothing like it
I love it great sound and response
Luis P.
Legmaker Dodge Durango HEMI Short Ram CAI 2011-Present 5.7L
Car totally diferent with the whole kit
Car totally diferent with the whole kit. Ive stood next to wide bodies and my car gets more attention at times . Ive bought the kit twice already.
Ding D.
2015-2023 Dodge Charger Carbon Fiber Wind Splitters
Fantastic emblem! Exactly what I was looking for
Fantastic emblem! Exactly what I was looking for. Great quality emblem.
Jacobus S.
Direct Connection Black Metallic Fender Badge
Worked great for my aftermarket hood on my Chrysler 2023 300C
Worked great for my aftermarket hood on my Chrysler 2023 300C. Thanks
Robert G.
Windshield Washer Squirter Relocation Kit Universal
Easy to install and makes car sound even better
Easy to install and makes car sound even better love the winn
Tracy H.
Legmaker Challenger/Charger Hellcat Demon & Redeye Air Intake
Awesome customer support
Awesome customer support. Had multiple issues with fedex and these guys were excellent in helping me sort everything out. The drop springs are great too! I highly recommend
Anonymous
Swift Spec-R Lowering springs Jeep Grand Cherokee 2011-2021
100/100! perfect CF crafted cold air intake for 6
100/100! perfect CF crafted cold air intake for 6.4 jeep .. even makes my AWE exhaust sound even deeper and you cam here this thing sucking when accelerating even at normal speeds🥶
srt.boizzz
Legmaker 392 TH Short Ram Jeep Grand Cherokee SRT 2012-2021
