Overview
The Mercedes-Benz W166, which includes models like the ML-Class (2012–2015) and GLE-Class (2015–2019), is known for its luxury, performance, and advanced engineering. A key component that contributes to its smooth ride and handling capabilities is the air suspension system, particularly the air shocks (also known as air struts). These specialized components play a critical role in maintaining ride comfort, adaptive handling, and vehicle leveling.
Function of Air Shocks
Air shocks in the W166 are part of the AIRMATIC suspension system, which uses compressed air to support the vehicle’s weight and provide variable damping. Unlike conventional coil-over shocks, air shocks use air bladders or air springs, which can be inflated or deflated depending on driving conditions. This allows the vehicle to:
- Adjust ride height automatically
- Provide a smoother and more adaptive ride
- Improve off-road capability by increasing ground clearance
- Lower the vehicle at high speeds for better aerodynamics
Components and Technology
Each air shock consists of the following key elements:
- Air spring (bladder): Replaces the steel coil spring, inflated with compressed air
- Shock absorber (damper): Controls oscillations and damping forces
- Electronic controls: Linked to the vehicle’s ECU and sensors for real-time adjustment
- Height sensors: Monitor vehicle height at each wheel
- Compressor and valve block: Supply and regulate air pressure across the system
Signs of Wear or Failure
As with any complex system, W166 air shocks can wear out over time. Common symptoms include:
- Vehicle sagging, especially after being parked overnight
- Uneven ride height or “leaning”
- Noticeably rough or bouncy ride
- Air compressor running frequently or noisily
- Warning lights on the dashboard (e.g., suspension fault)
Replacement and Maintenance
OEM or high-quality aftermarket air shocks are available for W166 models. Replacement is often necessary after 60,000–100,000 miles, depending on driving conditions. It’s essential to use compatible components, as poor-quality air shocks can lead to further suspension issues and reduced ride comfort.
Conclusion
Air shocks in the Mercedes-Benz W166 provide unmatched comfort, adaptive handling, and performance. Proper maintenance and timely replacement ensure your vehicle continues to deliver the premium driving experience expected from Mercedes-Benz.