UNRIVALED.

BILSTEIN B4 air suspension module:

The only fully functional module for all air suspension systems in uncompromising OE quality.

NOT ALL AIR SUSPENSION MODULES ARE THE SAME.

The BILSTEIN B4 air suspension module. The only fully functional module for all air suspension systems in uncompromising OE quality.

The passive air suspension module:

The active air suspension module with additional adjustment options:

The active air suspension module based on the “Skyhook” philosophy:

Key:
diagram

Comparison of the vehicle body movement.

Please make a selection to start the comparison:

BILSTEIN B4 air suspension module
The original wear part
A remanufactured part
A competitor’s product
Back
BILSTEIN B4 air suspension module

High-quality air suspension modules in uncompromising original manufacturer quality have only been available for a few years. Unfortunately this is why in the meantime, spare parts of significantly poorer quality and often with considerably restricted functions have spread on the market.
Learn how the quality of a BILSTEIN B4 air suspension module differs from other products available on the independent repair shop market.

The original wear part
A remanufactured part
A competitor’s product
1 2 2 3 4 5
The original wear part
A remanufactured part
A competitor’s product
1 2 3 4
1
Air bag:

The delicate axial bellows of the air spring provide very sensitive spring behaviour with a comparably low rolling radius. This ensures optimum functionality even in confined working chambers. Due to the permanent load (contraction, extension, different pressures and temperatures), the material is worn out and may eventually leak. If the air bellows cannot be inflated any more, the vehicle is no longer fit to drive.

Further developments:

Technical further developments from the original application to today’s part are usually easily recognizable. Due to higher efficiency and BILSTEIN’s obligation to increasingly employ environmentally friendly materials, the sheathing of the bump stop no longer contains chromium VI. Apart from that, all old parts by BILSTEIN are recycled in an environmentally friendly manner via the Partslife initiative.

Wear at the shock absorber and the electromagnetic control valve:

Due to the permanent movement and mileage, the high gas-pressure and the permanent oil contact, the seals in particular will become worn. If oil leaks, the air suspension module and other parts such as seals and valves lose their functionality.

Wear at the shock absorber and the electromagnetic control valve:

Due to the permanent movement and mileage, the high gas-pressure and the permanent oil contact, the seals in particular will become worn. If oil leaks, the air suspension module and other parts such as seals and valves lose their functionality.

The original wear part
A remanufactured part
A competitor’s product
1 3 4
1
Air bag:

In contrast to the original equipment or the BILSTEIN B4 air suspension module, a cross-ply bellow requiring a significantly higher rolling radius is used instead of a highly flexible axial bellow in the remanufactured product for Mercedes-Benz W220 shown here. Since the working chamber remains the same, the cross-ply bellow is subjected to a significantly higher level of wear – it cannot expand and collapse sufficiently inside the installation space. In addition, it does not achieve the same sensitive spring behaviour as an axial bellow.

Electromagnetic control valve:

Under certain circumstances, the electromagnetic control valve of a remanufactured product has controlled the oil flow in the shock absorber for thousands of kilometres already. Do you know if and how long it will continue working without problems? Only if you exchange all components by installing a completely new module is the full functionality of the entire air suspension system ensured for your customers.

Gas-pressure shock absorbers:

In remanufactured products, only the air spring is replaced. All other parts are reused. This means that you do not know how high the mileage of the installed shock absorber is. It is therefore possible that the damping powers of the individual wheels will differ significantly after all air suspension modules are exchanged.

The original wear part
A remanufactured part
A competitor’s product
1 3 4 5
1
Air bag:

In contrast to the BILSTEIN B4 air suspension module, competitors, e.g. in the application for the Mercedes-Benz W220 shown here, do not use delicate axial bellows but cross-ply bellows which do not correspond to the original equipment: Cross-ply bellows are not suitable for the application. The same level of comfort is not achieved.

Electromagnetic control valve:

The control device is no longer functional – there is no electromagnetic control valve and consequently no electromagnetic damping power adjustment. The electromagnets are only installed to simulate a functioning control for the on-board electronics.

Gas-pressure shock absorbers:

In the BILSTEIN B4 air suspension module, BILSTEIN uses the same shock absorbers as in the original equipment. In the application for the Mercedes-Benz W220, this is the highperformance mono-tube gas-pressure shock absorber with electronic damping power adjustment - and not a passive twin-tube gas-pressure shock absorber without control valve as in the competitor’s product.

Working chambers:

In some competitors’ products, neither the working chamber of the air spring nor the working chamber of the shock absorber correspond to the manufacturer’s specifications. This means that the competitors’ products do not match the original design.

part1
BILSTEIN B4 air suspension module

High-quality air suspension modules in uncompromising original manufacturer quality have only been available for a few years. Unfortunately this is why in the meantime, spare parts of significantly poorer quality and often with considerably restricted functions have spread on the market.
Learn how the quality of a BILSTEIN B4 air suspension module differs from other products available on the independent repair shop market.

part2 1 2 3 4
1
Air bag:
The delicate axial bellows of the air spring provide very sensitive spring behaviour with a comparably low rolling radius. This ensures optimum functionality even in confined working chambers. Due to the permanent load (contraction, extension, different pressures and temperatures), the material is worn out and may eventually leak. If the air bellows cannot be inflated any more, the vehicle is no longer fit to drive.
Further developments:
Technical further developments from the original application to today’s part are usually easily recognizable. Due to higher efficiency and BILSTEIN’s obligation to increasingly employ environmentally friendly materials, the sheathing of the bump stop no longer contains chromium VI. Apart from that, all old parts by BILSTEIN are recycled in an environmentally friendly manner via the Partslife initiative.
Wear at the shock absorber and the electromagnetic control valve:
Due to the permanent movement and mileage, the high gas-pressure and the permanent oil contact, the seals in particular will become worn. If oil leaks, the air suspension module and other parts such as seals and valves lose their functionality.
Wear at the shock absorber and the electromagnetic control valve:
Due to the permanent movement and mileage, the high gas-pressure and the permanent oil contact, the seals in particular will become worn. If oil leaks, the air suspension module and other parts such as seals and valves lose their functionality.
part3 1 3 4
1
Air bag:
In contrast to the original equipment or the BILSTEIN B4 air suspension module, a cross-ply bellow requiring a significantly higher rolling radius is used instead of a highly flexible axial bellow in the remanufactured product for Mercedes-Benz W220 shown here. Since the working chamber remains the same, the cross-ply bellow is subjected to a significantly higher level of wear – it cannot expand and collapse sufficiently inside the installation space. In addition, it does not achieve the same sensitive spring behaviour as an axial bellow.
Electromagnetic control valve:
Under certain circumstances, the electromagnetic control valve of a remanufactured product has controlled the oil flow in the shock absorber for thousands of kilometres already. Do you know if and how long it will continue working without problems? Only if you exchange all components by installing a completely new module is the full functionality of the entire air suspension system ensured for your customers.
Gas-pressure shock absorbers:
In remanufactured products, only the air spring is replaced. All other parts are reused. This means that you do not know how high the mileage of the installed shock absorber is. It is therefore possible that the damping powers of the individual wheels will differ significantly after all air suspension modules are exchanged.
part4 1 5 3 4
1
Air bag:
In contrast to the BILSTEIN B4 air suspension module, competitors, e.g. in the application for the Mercedes-Benz W220 shown here, do not use delicate axial bellows but cross-ply bellows which do not correspond to the original equipment: Cross-ply bellows are not suitable for the application. The same level of comfort is not achieved.
Electromagnetic control valve:
The control device is no longer functional – there is no electromagnetic control valve and consequently no electromagnetic damping power adjustment. The electromagnets are only installed to simulate a functioning control for the on-board electronics.
Gas-pressure shock absorbers:
In the BILSTEIN B4 air suspension module, BILSTEIN uses the same shock absorbers as in the original equipment. In the application for the Mercedes-Benz W220, this is the highperformance mono-tube gas-pressure shock absorber with electronic damping power adjustment - and not a passive twin-tube gas-pressure shock absorber without control valve as in the competitor’s product.
Working chambers:
In some competitors’ products, neither the working chamber of the air spring nor the working chamber of the shock absorber correspond to the manufacturer’s specifications. This means that the competitors’ products do not match the original design.
BILSTEIN B4 air suspension module

High-quality air suspension modules in uncompromising original manufacturer quality have only been available for a few years. Unfortunately this is why in the meantime, spare parts of significantly poorer quality and often with considerably restricted functions have spread on the market.

The original wear part

The original wear part is irreplaceable: except by the BILSTEIN original!

The original quality makes the difference.

Our BILSTEIN B4 air suspension module is the only air suspension module on the market that provides full functionality for all active and passive systems and is therefore the ideal OE replacement – for the same perfect driving experience as on day one.

A remanufactured part

A remanufactured part – appearances are deceiving!

What is remanufacturing?

For many vehicle components, remanufacturing, i.e. the reworking of old parts, is a reasonable and resource-saving alternative when compared to new parts. This, however, only applies if only individual components of a part are subjected to wear and must be exchanged. With air suspension modules, all components are subjected to wear:

  • wear in the air bag by: contraction, extension, different pressures and temperatures
  • wear in the gas-pressure shock absorber caused by the permanent movement and mileage (e.g. rebound and bump direction)
  • wear in the electromagnetic control valve and at the seals caused by permanent oil flow

A competitor’s product

A competitor’s product – the functionality is missing!

Maintain the functionality your customers opted for when they selected and paid for the vehicle!

With competitor products, the electromagnetic control valve often does not provide functionality. This means: Even if your customers had several characteristic curves or maps to choose from when they first bought the vehicle, they now only have one characteristic curve left. By installing a seemingly cheaper spare part, you take all alternative functions of your customer’s suspension away and risk reducing the driving safety!

100%

Only the BILSTEIN B4 air suspension module provides customers with optimum safety combined with the long service life of a factory-fitted new part! The BILSTEIN B4 air suspension module means optimum road handling, reliable braking and steering safety as well as maximum cornering stability.

Only with a BILSTEIN B4 air suspension module is the same driving experience as on day one, including all functionalities, maintained! Ensure your customers keep the full functionality they opted for when they bought the vehicle!

Our competitors’ products are often only passive. They do not offer functioning control and thus only one single suspension setting. Usually, the hard characteristic curve is selected. With this kind of product, your customers immediately loses all comfort alternatives.

For you and your customers, the BILSTEIN B4 air suspension module means fully functional OE replacement in uncompromising original manufacturer quality – from the pioneer of air suspension, tested in the most demanding conditions in the BILSTEIN road test.

We actively support repair shops. For the easy exchange of air suspension modules, we offer detailed installation instructions, practice-oriented installation videos, a competent technical hotline, comprehensive theoretical and practical training as well as eye-catching marketing material for a professional consultation of your customers.

0% old parts. 0% risk for you!

  • 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
/uploads/tx_productfinder/BILSTEIN_B4_air_suspension_application_overview_01.pdf
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2. Model series
3. Air suspension module
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Contact

ThyssenKrupp Bilstein GmbH

Milsper Straße 214, 58256 Ennepetal, Germany
P.O. Box 11 51, 58240 Ennepetal, Germany

Tel: +49 (0)2333 791-0
Fax: +49 (0)2333 791-4400

E-Mail: info(at)bilstein.de
Web: www.bilstein.com