In this article, Arnott discusses what it thinks every mechanic should know about air struts

With air suspension systems now well-established in the automotive industry, manufacturers use a variety of suspension configurations across passenger and heavy-duty vehicles to enhance comfort, handling, and adaptability.
Arnott explains that in most cases, air struts are a key component.
As such, it says technicians must understand air strut construction and function, as well as best practices for replacement, to deliver long-lasting, reliable service – the key to avoiding costly comebacks and increasing customer satisfaction.
Understanding Air Struts
An air strut combines a shock absorber with an air spring, supporting the vehicle’s weight using air pressure.
Its assembly features heavy-duty crimping rings that seal the air sleeve, a rolling piston with an O-ring to maintain airtightness, an integrated bump stop to prevent bottoming out, and a rubber sleeve, often protected by an aluminium canister.
Many air strut designs add a dust cover to prevent debris from entering the system and causing leaks.
Some advanced models feature a secondary air chamber, delivering dual spring rates for improved comfort and handling.
Arnott says this compact design is especially beneficial in rear axle setups, where space and cargo room are at a premium.

Air strut replacement best practices
While the process for replacing air struts is similar to that of conventional coil struts, attention to detail is critical due to the air strut’s complex components.
Arnott offers the following ‘pro tips’ for those undertaking air strut replacement:
• Always depressurise the air suspension system before removal.
• To prevent early failure when only replacing the air spring, inspect the shock absorber for oil leaks/loss of damping.
• Replace all O-rings and sealing components; never reuse them.
• Follow the manufacturer’s specifications carefully and note any model-specific nuances.
For many vehicles, using a pre-assembled replacement strut is the most efficient approach.
Arnott says this reduces workshop time and ensures the unit’s airtight integrity.
Arnott offers both complete assemblies and, where possible, individual air springs for specific models, providing flexibility for different repair situations.

Reliable replacement solutions
To reduce comebacks and increase customer satisfaction, Arnott believes quality replacement parts are key.
Arnott states that its range of direct-replacement air struts and air springs is engineered for OE-level performance, custom-tuned to each vehicle make and model.
As each unit is tested in the company’s United States and European facilities to ensure lasting reliability, Arnott says Australian workshops can rest assured they will be provided with quality solutions they can install with confidence.

For more information, visit www.arnottinc.com