Air Suspension Strut: Everything You Need to Know

Air suspension struts, commonly referred to as air shocks or air struts, are essential components in many modern vehicles. They provide a smooth ride, enhance handling, and adjust to different road conditions. In this article, we’ll discuss what air suspension struts are, how they work, the different types available, signs of failure, and the cost of replacement. Plus, we’ll go over DIY replacement steps and necessary supplies.

What is an Air Suspension Strut?

An air suspension strut is a type of shock absorber that uses air-filled bellows instead of traditional metal springs. These air struts help maintain a vehicle’s ride height, provide better shock absorption, and enhance overall ride comfort.

Many luxury cars, SUVs, and trucks come equipped with air suspension systems because of their ability to adjust ride height automatically based on load and road conditions.

How Does an Air Suspension Strut Work?

Air suspension struts function by using compressed air to support the vehicle’s weight. The main components include:

  • Air Springs (Bellows): Flexible rubber and plastic components that inflate or deflate to change the ride height.
  • Air Compressor: Pumps air into the suspension system.
  • Air Lines: Tubes that transport air between the compressor and the air springs.
  • Electronic Control Unit (ECU): Regulates air pressure and ride height adjustments.

The ECU communicates with sensors to monitor the vehicle’s position and adjust air pressure accordingly. When the system detects a change in weight or terrain, it inflates or deflates the air springs to compensate.

Types of Air Suspension Struts

There are several types of air suspension struts available, depending on vehicle requirements and use cases:

  1. OEM (Original Equipment Manufacturer) Air Struts: Designed to match the factory specifications of a vehicle.
  2. Aftermarket Air Struts: Third-party replacements that may offer enhanced performance or cost savings.
  3. Heavy-Duty Air Struts: Built for trucks and SUVs that carry heavy loads or tow trailers.
  4. Adjustable Air Struts: Allow the driver to manually adjust ride height and stiffness for a customizable driving experience.

Common Causes of Air Suspension Failure

Like any component, air suspension struts can wear out over time. Here are some common causes of failure:

  • Air leaks: The rubber bellows may develop cracks, leading to air leakage.
  • Compressor failure: If the compressor malfunctions, the struts won’t receive enough air pressure.
  • Faulty sensors: Damaged height sensors can lead to improper air pressure adjustments.
  • Electrical issues: Wiring problems can prevent the ECU from controlling the air suspension system properly.

When to Replace Your Air Suspension Struts

Regular maintenance can prolong the life of air struts, but they typically need replacement every 50,000 to 100,000 miles, depending on driving conditions. Here are some signs that indicate replacement is necessary:

  • Uneven ride height
  • Vehicle sagging on one side
  • Bumpy or uncomfortable ride
  • Air compressor running constantly
  • Warning lights on the dashboard

Air Suspension Strut Replacement Cost

The cost of replacing air struts depends on the vehicle make and model. On average:

  • OEM air struts: $500 - $1,500 per strut
  • Aftermarket air struts: $300 - $1,000 per strut
  • Labor costs: $200 - $600 per strut

For a full air suspension replacement, costs can range from $1,500 to $5,000.

DIY Replacement Guide for Air Suspension Struts

If you have mechanical experience, you can replace air struts yourself. Here’s a step-by-step guide:

Tools and Supplies Needed:

  • Jack and jack stands
  • Wrench set
  • Socket set
  • Screwdrivers
  • Air suspension struts (OEM or aftermarket)
  • Air compressor (if needed)
  • Air suspension fuse (if required)
  • Thread-locking compound

Step-by-Step Instructions:

  1. Disconnect the Battery: Prevent electrical issues by disconnecting the vehicle’s battery.
  2. Lift the Vehicle: Use a jack to lift the car and secure it with jack stands.
  3. Remove the Old Strut:
    • Locate the air suspension strut.
    • Disconnect any electrical connectors or air lines.
    • Remove the mounting bolts.
    • Carefully remove the old strut.
  5. Install the New Strut:
    • Position the new air strut in place.
    • Secure it with mounting bolts and apply thread-locking compound.
    • Reconnect air lines and electrical connections.
  7. Lower the Vehicle: Gently lower the car and reconnect the battery.
  8. Test the System: Start the vehicle and check for proper suspension operation.

Additional Consumables Needed:

  • Air suspension fuse (if needed)
  • Dielectric grease for electrical connections
  • Anti-seize lubricant for bolts
  • Air suspension compressor (if replacing the entire system)

Conclusion

An air suspension strut is a vital component that enhances ride quality and vehicle handling. Regular maintenance can extend its lifespan, but if you experience issues like sagging or an uncomfortable ride, it might be time for a replacement. While professional replacement can be costly, DIY installation is possible with the right tools and knowledge. Whether you opt for OEM or aftermarket air struts, ensuring your vehicle has a properly functioning suspension system will keep your ride smooth and safe.

If you're considering a replacement, compare prices, check for warranty coverage, and always follow proper installation procedures to get the best performance from your air suspension system.


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