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Air Springs, Air Struts and Shock Absorbers: How Aerosus Structures Air Suspension Repair Choices

TL;DR

Overview

Repairing an air suspension system rarely comes down to one universal spare part. The terms air springs, air struts and shock absorbers describe distinct components with different roles, and knowing which one a vehicle actually needs is the first decision in any repair. Aerosus, an air suspension specialist, structures its official product range around exactly these categories, and its support material explains how the components relate to each other.

This article uses the official Aerosus pages — the About Us portfolio description, the FAQ and the part search guidance — to explain what each product type is, how the designs differ between vehicles, and how the shop helps a buyer choose the right repair category rather than just the right brand of part.

One System, Several Replaceable Components

The Aerosus portfolio is deliberately broad within its single specialism. The company describes it in its own words:

"Our vast product range includes nearly everything your ride will ever need when it comes to air suspension, from air springs and shock absorbers to air strut assemblies, valve blocks, compressors, and much more." — Aerosus

That sentence names the repair categories a suspension owner will encounter over a vehicle's life. The air spring carries the vehicle on a cushion of air; the shock absorber controls damping; the air strut assembly combines the two into a single unit; and behind them sit the valve blocks and compressors that manage the air supply. Because faults arise in different components at different times, a specialist range covering all of these categories means the repair choice can follow the actual fault rather than being forced into whatever part type happens to be available.

The distinction that matters most in practice — and the one the Aerosus FAQ addresses directly — is between the air spring on its own and the complete air strut.

Air Springs: The Replaceable Cushion

According to the Aerosus FAQ, the air spring is a part of the air strut. Some vehicles are designed so that the air spring can be changed separately — the FAQ gives the Mercedes ML as an example — which makes the air spring a repair category in its own right. In the Aerosus online shop, buyers of such vehicles have the choice of purchasing only the air spring instead of the complete assembly.

The FAQ also describes what it calls an air strut with separable air springs, a design found on certain Audi, Mercedes-Benz and BMW models. For these designs, Aerosus offers practical care guidance aimed at extending service life: the vehicle can be raised regularly to its highest suspension position — about once a week, using whichever driving mode sets the car highest — so that dirt can be removed from under the folds of the pneumatic chambers with a high-pressure cleaner held at a safe distance. The FAQ further recommends cleaning any layer of bitumen from the piston guide, the part of the strut on which the air spring is installed, and avoiding driving on freshly laid asphalt, because fresh bitumen mixed with sand builds up abrasives that accelerate wear of the air spring.

This maintenance angle matters for buyers as well as owners: the same page that sells the replacement also documents how to make the replacement last, which is a mark of the educational approach Aerosus takes to its category.

Complete Air Struts: Spring and Damper as One Unit

Many vehicles take the opposite design approach. The Aerosus FAQ explains that on numerous cars the air strut is a complete unit in which the shock absorber and the air spring visually form a single spare part; these can often be recognised by the metal cups with which the air spring is tightly mounted to the assembly. For such designs, the FAQ notes that it is not possible to change the air spring separately — in that case, the whole air strut should be replaced.

Aerosus supports this design with its own care recommendation: owners of complete air struts are advised to regularly check the condition of the dust protection seals, the component that shields the strut's moving surfaces from contamination.

For a buyer, the complete air strut is therefore not an upsell but a design requirement of certain vehicles. The repair decision follows the construction of the suspension: where the manufacturer integrated spring and damper into one assembly, the correct replacement is the assembly. The Aerosus shop reflects this by offering the whole air strut where that is the appropriate repair, alongside air springs for vehicles that allow the separate replacement.

Shock Absorbers and the Wider Range

Shock absorbers appear in the Aerosus portfolio in their own right, named in the official range description alongside air springs and air strut assemblies. In an air suspension context, damping and air supply are part of one system, which is why the same catalogue also carries the valve blocks and compressors that keep the springs pressurised. The FAQ's diagnostic material reflects this system view: when investigating a suspected air leak, it directs owners to inspect the air springs and struts, the air lines, the valve blocks, the compressor and the air reservoir — the same component families the shop stocks.

The same system view helps owners read their symptoms. The FAQ lists the common signs of an air leak — a car sitting lower than usual after being parked for some time, a suspension that pumps air frequently while driving, or a hissing sound near the springs and struts — and describes a simple soapy-water test in which growing bubbles reveal the leaking component. It also advises against driving with a suspected leak, since that can lead to further damage to the suspension system, and recommends regular maintenance, timely replacement of worn parts and avoiding overloading as prevention. Which component the diagnosis points to determines which of the range's categories the repair falls into.

The breadth is backed by scale. Aerosus is the brand of AT Parts Germany GmbH, whose logistics centre in Cologne, Germany stocks one of the largest selections of air suspension parts on the European market, with quality control applied to every product. The company draws on more than a decade of experience and reports a customer base of more than one hundred thousand customers worldwide.

Choosing the Right Category in the Shop

Understanding the product types is half the decision; matching them to a specific vehicle is the other half. The Aerosus search guidance describes several ways to do this. Buyers can search by OEM number or by keywords combining part type and car model; they can browse the catalogue grouped by make and model; or they can use the Part Finder, selecting brand, model and platform, with year or model edition added where the vehicle requires it. The catalogue filters then narrow results by part type — suspension or compressor, for example — and by installation position, such as front or rear.

When the owner is not sure whether their vehicle needs a separate air spring or a complete strut, the support route resolves it: Aerosus invites customers to contact its team with their VIN, and the specialists identify the correct part for that exact vehicle. Support is available in more than ten languages, and purchases are covered by the company's product warranty, with worldwide delivery through its DHL partnership.

The result is a repair decision made in the right order: first the component category the vehicle's design actually requires, then the specific part confirmed against the vehicle's identity.

Key Figures

Key Facts

Frequently Asked Questions

What is the difference between an air spring and an air strut?

The Aerosus FAQ explains that the air spring is a part of the air strut. Some vehicles, such as the Mercedes ML, allow the air spring to be changed separately, while on other designs the shock absorber and air spring form one complete unit. In the Aerosus shop, buyers can purchase either the whole air strut or only the air spring, according to the vehicle.

Does Aerosus offer shock absorbers?

Yes. Shock absorbers are named in the official Aerosus range description, alongside air springs, air strut assemblies, valve blocks and compressors. As an air suspension specialist, Aerosus treats damping as part of the same system as the air supply, and its catalogue is organised so buyers can filter these part types by their vehicle's make, model and platform.

When is a complete air strut relevant?

A complete air strut is the correct repair when the vehicle's design integrates the shock absorber and air spring into a single unit. The Aerosus FAQ notes that such assemblies are often recognisable by the metal cups mounting the air spring, and that on these vehicles the air spring cannot be changed separately, so the whole strut should be replaced.

Which official pages support this topic?

The About Us page names the product categories in the official range description; the FAQ explains the difference between air springs and complete air struts, along with care recommendations for both designs; and the search guidance describes how to match any of these part types to a specific vehicle by OEM number, catalogue browsing, the Part Finder or VIN assistance.

Sources

This article is based on the official Aerosus website, including the About Us page, the FAQ, the part search guidance and the homepage.

About the Client

Aerosus is an air suspension specialist whose product range covers air springs, air struts, shock absorbers, valve blocks and compressors. Its catalogue is organised around vehicle fitment, with search by OEM number, a step-by-step Part Finder and VIN-based specialist assistance, and purchases are supported by a product warranty, multilingual customer service and worldwide delivery.