The Mercedes-Benz S-Class Coupe (C217) is renowned for its exceptional comfort and advanced suspension technology. Produced from 2014 onwards, this luxury coupe achieves outstanding ride quality primarily through its standard-fitted Airmatic air suspension system. The Aerosus air strut designed specifically for the rear right axle is fully compatible with all C217 models equipped with Airmatic suspension, whether configured with rear-wheel drive or 4Matic all-wheel drive.
Functionality of the C217 Mercedes S-Class Coupe Suspension
Mercedes-Benz vehicles equipped with an air suspension system are identified as Airmatic models. The air struts used in the C217 series include the Adaptive Damping System (ADS) featuring solenoid valves. These valves dynamically adjust the suspension stiffness by regulating oil flow within the ADS system. With input from multiple sensors, the vehicle’s control unit automatically adjusts suspension settings according to selected driving modes (e.g., Comfort, Sport), road conditions, and driving speed. For instance, at higher speeds, the suspension becomes firmer to enhance driving stability.
Air-Spring Leakage or Level Control Failed - Reasons for a Defect
The front of your Mercedes lowers unilaterally or stays crooked? As with many other car parts, air struts wear out, so they need to be replaced over the years. First signs of a problem are leaks of the shock absorbers due to oil loss as well as a reduced resilience due to compressed air loss. The vehicle lowers overnight on the front axle or the compressor runs too long? This may be an indication that the affected suspension parts should be replaced. Even if the shock absorbers leak oil and your car loses oil or you hear loud thumping noises while driving, you should not wait too long before repairing the failed parts.
A cable break, faulty solenoid valve on the valve block or damaged pressure relief valve on the compressor can also cause that the vehicle can no longer be lowered or the damping is significantly harder than usual. Furthermore, residual pressure retaining valves, level or acceleration sensors may also be defective. In such case, these parts supply the Airmatic control with improper values, which also makes the air suspension shocks quite hard.
Tips on Changing and Correctly Installing Suspension Parts
In any case, it is advisable to leave the installation or assembly of our spare parts to expert workshop staff.
After installing the front shock absorber, connect the diagnostic device to the vehicle and fill the shock absorbers with compressed air according to the instructions of the vehicle manufacturer and initiate the next steps.
After installing the front air-suspension strut, don't immediately fill the air struts with compressed air, as the axles of the lifted vehicle are hanging down and are therefore outside the control range of the Airmatic control unit. For this reason, after installing the new shock absorber, you should lower the vehicle until the wheels are back in contact with the ground and the distance between the wheel centre and the fender is approximately 40 cm. Please don't lower the vehicle completely, as the air spring strut isn't completely filled with compressed air.
After installing the front air-suspension strut, don't immediately fill the air struts with compressed air, as the axles of the lifted vehicle are hanging down and are therefore outside the control range of the Airmatic control unit. For this reason, after installing the new shock absorber, you should lower the vehicle until the wheels are back in contact with the ground and the distance between the wheel centre and the fender is approximately 40 cm. Please don't lower the vehicle completely, as the air spring strut isn't completely filled with compressed air. In any case, it is advisable to leave the installation or assembly of our spare parts to expert workshop staff.
Save Costs with Air Suspension Struts by Aerosus
To ensure the tightness of the struts, they undergo a tightness and cycle test, conducted by our team of experts in Germany. This ensures a high degree of safety. Since the air struts of an axle usually wear out equally, we always recommend their replacement in pairs. For this purpose, we offer you a 10% discount on pair purchases. In addition, that saves you the second visit to the garage. Furthermore, when buying online, you benefit from the permanently low prices and the two-year warranty.
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Air Suspension Specialist
