Looking to replace your worn or failing OEM air suspension? The Function and Form Type 4 M Class suspension coilover kit is a full air suspension delete system for the Mercedes-Benz W166 chassis (2011–2019 M-Class). Designed for reliability, better handling, and a lowered ride height, this kit eliminates the complex and failure-prone air system and replaces it with a performance-tuned coilover setup.

The OEM air suspension on the M-Class—especially models like the ML350 and ML550—is known for expensive repairs and recurring problems. Common symptoms include the vehicle sagging overnight, uneven ride height, noisy compressors, or the dreaded dashboard warning: “Airmatic malfunction – visit workshop.” Diagnostic codes like C1525-005, C1511-002, or C1516-008 often indicate leaks, compressor failure, or sensor issues, all of which can quickly add up in repair costs.

This Type 4 M Class suspension coilover kit is engineered as a direct-fit conversion for vehicles originally equipped with AIRMATIC. It completely removes the need for air struts, compressors, height sensors, and control modules. Instead, you get a robust, fully mechanical coilover system with precision-tuned spring rates, adjustable ride height, and superior reliability.

Each kit features inverted monotube dampers, built to handle the weight and dynamic load of SUVs like the W166. The inverted design improves rigidity under side loads and reduces unsprung weight—resulting in better steering feel and sharper handling, whether you’re driving on the highway or carving through canyon roads.

With independent ride height adjustment via a threaded shock body, you can fine-tune your M-Class’s stance to your exact preference—lower it for aesthetics and improved cornering or raise it slightly for better clearance. Ride height adjustments do not affect spring preload or suspension stroke, preserving comfort and control across a wide range of settings.

The kit also includes SUV-specific spring rates optimized for daily driving with a firm, planted feel and reduced body roll. All components are powder-coated or anodized to withstand harsh weather and road grime, and the shocks are fully rebuildable for long-term service.

This is more than just a fix—it’s a complete upgrade to your M Class suspension, offering improved driving dynamics, long-term durability, and a cleaner, more aggressive look.

Key Features:

Full air suspension delete kit for W166 (2011–2019)

Replaces AIRMATIC with coilover system

Eliminates air struts, compressor, sensors, and ECU

Inverted monotube dampers for SUV strength

Independent ride height adjustment (threaded body)

Spring rates tuned for daily and spirited driving

Corrosion-resistant finish (powder-coated + anodized)

Fully rebuildable for long-term use

Fits ML350, ML550, and other W166 M-Class models

Solves common error codes: C1525-005, C1511-002, C1516-008

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