AIR SUSPENSION? TRUST THE PIONEER!

The BILSTEIN B4 air suspension module: the only fully functional air suspension module – offering uncompromising OE quality.

AIR SUSPENSION? TRUST THE PIONEER!

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The unique benefits of the BILSTEIN B4 air suspension module

0% old parts. 0% risk for you!

BILSTEIN B4 air suspension modules are made of 100% new parts
  • New air spring
  • New high-performance BILSTEIN gas-pressure shock absorber
  • New and fully functional electromagnetic control valve
  • High-quality individual components compliant with current quality and environmental standards

The inner values count

The quality benefits of a BILSTEIN B4 air suspension module vs. other products sold on the free workshop market
Remanufactured part Competing products

An air suspension module experiences wear in all of its component parts. The remanufacturing (reworking of old parts) may present a reasonable and cost-saving alternative to new parts. This only applies if only single components of the part are actually subject to wear.

An air suspension module experiences wear in all of its component parts. The remanufacturing (reworking of old parts) may present a reasonable and cost-saving alternative to new parts. This only applies if only single components of the part are actually subject to wear.

  1. 1. Air bag

    Axial bellows

    In the original BILSTEIN air suspension module, the delicate axial bellows of the air spring provide sensitive response and behavior over the road. In contrast, remanufactured air springs use a cross-ply bellows system – requiring a significantly higher rolling radius and wearing out much more quickly.

    Cross-ply bellows

    This cross-ply bellows of a remanufactured product intended for the Mercedes-Benz W220 cannot expand and collapse as it needs to. The original road performance can't be reduplicated, resulting in increased wear. There is no way to achieve the same sensitive suspension response that is obtained with axial bellows.

  2. 2. Gas-pressure shock absorber

    New gas-pressure shock absorber

    The BILSTEIN B4 air suspension module packs a new, high-end, OE-quality single-tube gas-pressure shock absorber. This helps preserve the original running characteristics and avoid additional damage resulting from irregular wear.

    Recycled wear part

    With remanufactured air suspension modules only the air spring is replaced. The old shock absorber remains. The mileage of the shock absorber is not traceable, which in exchange lead to demonstrably worse driving characteristics and in the event of damage can mean a risk for you!

  3. 3. Electromagnetic control valve

    New control valve

    The BILSTEIN B4 air suspension module mounts a new, fully functional electromagnetic control valve. This is the only way the original driving experience with the full spectrum of functionalities is preserved as if from day one, combined with the durability of a brand new part.

    Remanufactured control valve

    the electromagnetic control valve of a remanufactured air spring module may have already logged thousands of road miles If oil leaks occur as a result, the air suspension module and other parts lose their functionality. Only by replacing all wear components with a new module is full functionality of the entire air suspension system ensured.

  1. Axial bellows

    In the original BILSTEIN air suspension module, the delicate axial bellows of the air spring provide sensitive response and behavior over the road. In contrast, remanufactured air springs use a cross-ply bellows system – requiring a significantly higher rolling radius and wearing out much more quickly.

  2. New gas-pressure shock absorber

    The BILSTEIN B4 air suspension module packs a new, high-end, OE-quality single-tube gas-pressure shock absorber. This helps preserve the original running characteristics and avoid additional damage resulting from irregular wear.

  3. New control valve

    The BILSTEIN B4 air suspension module mounts a new, fully functional electromagnetic control valve. This is the only way the original driving experience with the full spectrum of functionalities is preserved as if from day one, combined with the durability of a brand new part.

Competing air suspension systems often come with a functionless electromagnetic control valve. By installing a seemingly cheaper part, you remove functionality of your customer’s suspension and risk reducing driver safety.

Competing air suspension systems often come with a functionless electromagnetic control valve. By installing a seemingly cheaper part, you remove functionality of your customer’s suspension and risk reducing driver safety.

  1. 1. Working chambers

    in line with vehicle manufacturer specifications

    Only BILSTEIN-made air suspension modules have working chambers that are always in line with the vehicle manufacturer's specifications. This helps reduce wear and optimises suspension performance.

    Different dimensions

    In some competitor products, neither the working chamber of the air spring, nor the working chamber of the shock absorber correspond to the vehicle manufacturer specifications. These parts are built out of original OEM specifications

  2. 2. Absorber technology

    Monotube gas-pressure shock absorbers

    A peculiarity of OE shock absorbers, amongst other things, lies in the electronic damping adjustment used in the monotube gas-pressure shock absorber for the Mercedes-Benz W220. Unlike many competitors, BILSTEIN uses OE shock absorbers in all examples of the B4 air suspension modules.

    Passive twin-tube absorber

    Competitor products utilize a passive twin-tube gas-pressure shock absorber without a control valve. In contrast, original equipment uses a high-performance BILSTEIN monotube gas-pressure shock absorber with electronic damping adjustment.

  3. 3. Control technology

    Electromagnetic control valve

    Unlike the competition, BILSTEIN only uses new and fully functional electromagnetic control valves. This helps preserve the vehicle's road safety, and customers get exactly the function they have chosen and paid for when they bought the vehicle.

    Functionless controls

    Competing products often come without a control valve, meaning there is no electromagnetic damping adjustment. The electromagnets are only installed to simulate a functioning electronic controls to avoid check engine lights and fault codes.

  1. in line with vehicle manufacturer specifications

    Only BILSTEIN-made air suspension modules have working chambers that are always in line with the vehicle manufacturer's specifications. This helps reduce wear and optimises suspension performance.

  2. Monotube gas-pressure shock absorbers

    A peculiarity of OE shock absorbers, amongst other things, lies in the electronic damping adjustment used in the monotube gas-pressure shock absorber for the Mercedes-Benz W220. Unlike many competitors, BILSTEIN uses OE shock absorbers in all examples of the B4 air suspension modules.

  3. Electromagnetic control valve

    Unlike the competition, BILSTEIN only uses new and fully functional electromagnetic control valves. This helps preserve the vehicle's road safety, and customers get exactly the function they have chosen and paid for when they bought the vehicle.

For more information, download our detailed product brochure (PDF )

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Hand in Hand with the large companies of the car industry

Optimum innovation transfer from original equipment for perfect OE replacement
  • Mercedes-Benz

    For nearly 60 years, Mercedes-Benz and BILSTEIN have joined forces to develop state-of-the-art innovations in suspension systems - including the introduction of the first active air suspension module for the Mercedes-Benz S-Class W220.

  • BMW

    To enhance the typical driving pleasure of a BMW platform, air suspension technology is employed in an increasing number of models. Currently BILSTEIN’s OE replacement program includes applications for the BMW 5 Touring (E39), BMW 7 Series (E65, E66, E67) and BMW X5 (E53).

  • Land Rover

    The air suspension of the Land Rover vehicles automatically adjusts to loads and can be elevated or lowered (e.g. in the Discovery S). We are particularly proud of our BILSTEIN B6 4600 air suspension module for the Land Rover Discovery III.

  • Jaguar

    The X350 series was the first to feature an aluminum vehicle body and air suspension modules as standard for maximum comfort. Currently our OE replacement selection includes applications for the jaguar XJ models X350 and X358.

  • Porsche

    Porsche offers optional air suspension for the Macan and Cayenne models Our applications include the Cayenne 9PA and 92A series, as well as the Macan 95B and the latest Cayenne platform – the P0536.

  • Volkswagen

    The premium models VW Phaeton (3D_) and Touareg (7LA, 7L6, 7L7 und 7P5) can be fitted with optional air suspension modules and freely selectable driving programmes. BILSTEIN naturally provides replacement modules of uncompromising OE quality.

  • Bentley

    Air suspension systems with multiple modi are fitted as standard with all the latest Bentley models, such as the Bentley Continental Coupé (3W_) and the Bentley Continental Cabriolet (3W_).

  • Audi

    The Audi Adaptive Air Suspension gives large models such as the Audi A6 or A8 a supple ride and a sporty ride at the same time. Our portfolio of replacement parts includes air suspension modules for the Audi Q7 (4L).

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Helpful contents and downloads

BILSTEIN B4 air suspension module flyer, poster & Installation Checklist

Bilstein Academy

We gear you up for the change to ensure customer satisfaction also in the future.

The BILSTEIN Academy offers tailor-made practical seminars for every application, every operation and every requirement, conveying elementary knowledge on shock absorbers, suspensions and, naturally, air suspension modules. Our selection includes
informative theoretical units and permanent practical impressions, which benefit your customers daily in the form of a competent service and thus increase your sales in the long term.

Please use the form to get in touch for further info or inquiries.