The Mercedes W221 utilizes a unique suspension system known as AIRMATIC. It is a highly-responsive system that replaces the traditional steel-spring design with adjustable air springs. This suspension set-up can self adjust based on driving habits, road conditions, and handling requirements.
Common Suspension Issues in the W221
While this unique air suspension system provides numerous benefits, it can fall victim to the occasional defect or malfunction. There are several reasons for such a failure. These include:
Compressor breakdown
The compressor is a crucial part of the system. Simply put, it pumps up the suspension bags with air. It can experience problems when it suffers from airflow blockages or a loss in pressure.
Air leaks
The AIRMATIC struts may have air leaks. These leaks will result in improper pressure levels. Leaks can develop at connection points, in defective seals, or joints of the shock.
AIRMATIC defect or malfunction
The actual AIRMATIC shocks may malfunction or be defective as soon as they are installed. This could be due to incorrect installation or a defective part from the factory. Over time, normal wear and tear may also be rough on the shocks and cause a breakdown.
Problems with the relay
Your relay is a switch which opens and closes the circuits in your compressor. Sometimes, it may fail due to extensive periods of interaction with the compressor. When the relay malfunctions, the proper signals will not be sent to the suspension system.
Signs of Suspension Failure in Mercedes W221
There are a few signs or red flags that can alert you to a potential suspension failure in your Mercedes.
Vehicle sags or is lower on one side
Airbags located in the system keep the suspension and your vehicle level. When there is a problem, your automobile may sag on one side or seem higher in the front than the back.
Air compressor never shuts off
The compressor maintains the air pressure in the suspension air bags. If there is a leak in the bag, the compressor will continuously run in order to keep the proper amount of air pressure. You may still hear the compressor even after you turn off the engine.
Rough riding vehicle
Your suspension is designed to provide ultimate comfort while driving and riding in your Mercedes. If your ride suddenly becomes bumpy, rough, or oddly uncomfortable, it can be a sign that your suspension is failing.
Difficult steering
If the AIRMATIC suspension system is malfunctioning, it may become increasingly hard to steer your vehicle. It may feel as though you are “fighting” the wheel to keep the car straight. This is another sign of a potentially serious problem.
