FCS Q4001 Air Suspension Spring - Rear

Rear Air Suspension Spring for Mercedes-Benz

Restore rear ride support on select Mercedes-Benz SUVs with the FCS Q4001 air suspension spring. This rear air suspension spring is built for vehicles equipped with AIRMATIC, and on listed applications with ADS, to help maintain proper stance and suspension response.

Compatible with a wide range of Mercedes-Benz GL, GLE, and ML models, including rear applications for the GLE400, GLE350, GLS450, GL450, ML350, and GL550. The FCS Q4001 is a direct-fit replacement for rear air suspension service on vehicles from 2006 through 2019.

Key Features

• Rear air suspension spring for Mercedes-Benz AIRMATIC-equipped vehicles
• Fits select applications with ADS where noted in the fitment list
• Direct replacement for rear suspension service on GL, GLE, GLS, and ML models
• FCS Q4001 part number for easy identification and ordering
• Designed for confirmed rear fitment across multiple Mercedes-Benz chassis generations

Detailed Fitment and Use

The FCS Q4001 is used to replace a worn or leaking rear air spring on Mercedes-Benz vehicles that rely on air suspension for load leveling and ride height control. Fits 2016-2019 Mercedes-Benz GLE400, rear; Fits 2017-2019 Mercedes-Benz GLE43 AMG, rear; Fits 2017-2019 Mercedes-Benz GLS450, rear; Fits 2007-2016 Mercedes-Benz GL450, rear; and Fits 2006-2012 Mercedes-Benz ML350, rear. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Problems It Can Help Solve

• Rear end sagging or uneven ride height
• Air spring leaks that cause the suspension to drop overnight
• Harsh rear suspension response from a worn air spring
• Warning lights related to air suspension height control
• Poor load support in the rear suspension

Installation Notes and Tips

Verify the vehicle is equipped with rear AIRMATIC, and ADS where required, before ordering. Confirm the model, year, and rear position against the fitment list, since Mercedes-Benz GL, GLE, GLS, and ML platforms use different suspension configurations. Professional installation is recommended, and the air suspension system should be inspected for leaks, compressor issues, and related wear before returning the vehicle to service.

Quality Assurance

FCS offers this rear air suspension spring as a replacement part identified by part number Q4001. Use the confirmed fitment data to match the correct Mercedes-Benz application before installation.