BILSTEIN B4 Front Left Air Suspension Module for Mercedes Benz

OE replacement air suspension module in OE quality

The Bilstein B4 air suspension module is the OE replacement, in 100% OE quality, for premium vehicles with factory air suspension – from saloons and SUVs to sports cars. Available for active and passive systems, it uses patented technologies known from OE, such as the Bilstein DampTronic Sky system.

The B4 air suspension module at a glance

It combines shock absorber, spring and level control in one part and gives new-car comfort, safety and stability. As a 100% new part, it drives like day one.

The OE replacement for premium cars with air suspension

Long motorway runs, heavy city traffic or a full load – the module keeps the car safe and comfortable. It compensates for load automatically, keeps the ride height constant and, in active systems, reacts instantly to bumps – in saloons, SUVs and sports cars alike.

Product benefits

Developed with leading premium car makers for OE and made to the same standards for the aftermarket. As a 100% new part it combines air spring and damper in one component.

• Developed and made to OE standards
• Made in the same factories as the original equipment (e.g. Mercedes-Benz, BMW, Porsche, VW)
• 100% new – no reconditioned used parts
• Patented Bilstein DampTronic or DampMatic technology, depending on the model
• Wide coverage for active and passive air suspension

What makes the B4 air suspension module stand out

• The right choice to keep the original air suspension, with all its comfort and control functions, for an as-new drive.
• A top-quality product with outstanding damping and springing – its design puts damping, springing and level control into a single component.
• No reworking, no compromise: every module is completely new, never a reconditioned used part; all components are newly made and matched to each other.
• As an OE system supplier, Bilstein develops air suspension modules with leading premium car makers, and that experience goes straight into the aftermarket – same manufacturing processes, same quality standards.
• Every module is tested on the road and on test tracks in Bilstein's road tests, giving damping and comfort identical to the original-equipment specification.
• Intensive testing – long-term stress tests, extreme salt-spray tests, scratch tests and 1:1 checks before delivery – for maximum durability and quality.

Where the B4 air suspension module is used

• Comfort on long journeys: smooths out bumps and uneven surfaces on motorways and country roads, for relaxed, precise handling even at high speed.
• Stable when fully loaded: with heavy luggage or several passengers it keeps the ride height constant, with steady comfort, safety and straight-line stability.
• Comfort in town: responds smoothly and stays stable over cobbles and potholes, for a smooth ride, short stopping distances and precise handling.
• Precision for performance cars: optimum damping and precise handling in powerful saloons and sports cars, even with fast load changes or dynamic driving.
• Confident on any surface: on premium SUVs with air suspension it combines road comfort with safe handling on unmade roads or light off-road.
• Ideal for towing: stabilises the car when towing a caravan or trailer, reduces sway and keeps the combination on track, even with high nose weights.

Frequently asked questions

Can air springs or air suspension modules be fitted after their best-before date?

The best-before date is really a shelf-life date and must be kept until the part is first used: the air spring is partly pre-filled with nitrogen at 3–5 bar, and the bellows must be protected from creasing, kinking and deformation while stored.

Is there installation information for workshops?

Dampers are fitted following the vehicle maker's instructions. For air springs and air suspension modules Bilstein provides installation videos and instructions, linked to the part number in its online catalogue.

Can I lift a car with air suspension while the engine is running – will the bellows burst?

No, nothing will happen. But never lower a car onto an air spring that has no pressure in it.

Why buy new Bilstein air suspension modules when remanufactured ones are cheaper?

Reconditioned or repaired used parts contain used dampers with unknown mileage and possible damage, and some have solenoid valves disabled, turning an active module into a passive one. Bilstein air suspension modules are 100% new and match the original parts.

Product details

• Bilstein part number: 44-343064
• Vehicle make: Mercedes Benz
• EAN: 4025258935375

Vehicle Fitment

📦 Regal Autosport Shipping Policy

Shipping Destinations

We proudly ship our products across the UK, Europe, the USA, Australia, South East Asia, and other locations globally.There are no regions we restrict shipping to.

Carriers and Delivery Times

• United Kingdom: Royal Mail for small items; DPD Local for parcels up to 30kg.
  Delivery estimate: 1–2 business days.
  

• International:
  

• Small packages: Royal Mail (postal service)
  

• Small/medium/large parcels: DHL Express.
  Delivery estimate: 2–15 business days, depending on destination.
  

Please note: We do not ship on weekends or UK Bank Holidays. Orders placed after 2 PM will be processed the following business day.

Order Processing

Orders placed before 2 PM are typically processed and dispatched the same day.
Orders placed after 2 PM will be processed on the next business day.

Shipping Costs

Shipping costs are calculated automatically at checkout based on the volumetric weight of your order.
We do not offer free shipping — instead, we focus on keeping product prices as competitive as possible.

Tracking

All orders are shipped via tracked and signed-for services.
Tracking information will be provided and can be accessed via:

• Your Regal Autosport account page in Shopify
  

• The respective courier’s website
  

Customs, Duties, and Taxes

• UK Customers: Prices include UK VAT.
  

• International Customers:
  

• UK VAT will be deducted at checkout.
  

• Customers are responsible for all customs duties, import taxes, and fees applicable in their country.
  

• Delivery times may be delayed by customs clearance — time is not of the essence for deliveries.
  

Lost or Damaged Items

In the rare case of lost shipments:

• If the courier confirms the parcel as lost, we will re-ship your order as quickly as possible.
  

For damaged shipments:

• Customers must assist us in submitting a claim with the courier.
  

• After confirmation, we will replace the item or offer a discount, depending on the situation.
  

We take great care in packaging, but please inspect your order upon arrival and contact us immediately if the item is damaged or missing.

Backorders

Orders containing backordered items will be dispatched once all items are available.
We do not split ship orders. If you require partial delivery, please place separate orders for in-stock and backordered items.

Local Pickup and Delivery

We do not offer local pickup or local delivery for online orders due to security verification policies.
However, customers are welcome to visit our store and pay via chip and PIN.

📦 Regal Autosport Shipping FAQs

Where do you ship to?

We ship across the UK, Europe, the USA, Australia, South East Asia, and worldwide.
 There are no regions we restrict shipping to.

Which carriers do you use?

• UK orders: Royal Mail (small items), DPD Local (parcels up to 30kg)
  
  

• International orders: Royal Mail (small packages) or DHL Express (larger parcels)
  
  

How long will my order take to arrive?

• UK deliveries: Typically 1–2 business days after dispatch.
  

• International deliveries: Usually 2–15 business days, depending on location.
  

Please note: We do not ship on weekends or UK Bank Holidays.

When will my order be dispatched?

Orders placed before 2 PM are usually dispatched the same business day.
 Orders placed after 2 PM are processed on the next working day.

How much does shipping cost?

Shipping costs are calculated at checkout based on the volumetric weight of your items.
 We do not offer free shipping — instead, we keep our product prices as competitive as possible.

Will I receive tracking information?

Yes!
All shipments are tracked and signed for. You’ll receive tracking information by email and can also track your order via:

• Your Regal Autosport account page
  

• The courier’s own website
  

Do I have to pay customs charges or import taxes?

• UK Customers: Prices include UK VAT.
  

• International Customers:
  

• We deduct UK VAT at checkout.
  

• You are responsible for any local customs duties, import taxes, or fees.
  

Delivery times may be affected by customs clearance, and time is not of the essence for international deliveries.

What happens if my order is lost or damaged?

• If your shipment is lost, we will re-ship your order once the courier confirms the loss.
  

• If your order is damaged, we will work with you to file a courier claim and either replace the item or offer a discount based on the situation.
  

Please inspect your delivery upon arrival and contact us immediately if there are any issues.

What if my item is on backorder?

Orders containing backordered items will be held until all items are available.
We do not split ship orders. If you require partial delivery, please place separate orders for in-stock and backordered items.

Can I collect my order in person?

We do not offer local pickup or local delivery for online orders due to security verification.
However, you are welcome to visit our store and pay via chip and PIN if you wish to purchase in person.