Unity 28-113701 Air Suspension Strut - Front Left

Front Left Air Suspension Strut

The Unity 28-113701 is an electronic air suspension strut assembly for the front left position on select Mercedes-Benz models with Airmatic and 4Matic. Built to OEM specifications, this front air strut is intended for drivers replacing a worn or leaking suspension unit on a Mercedes-Benz CL550, S350, S450, or S550.

Unity Automotive has more than 40 years of aftermarket suspension experience, with a product line focused on OE-style fit and consistent build quality. The Electronic Air Suspension Strut Assembly line is designed for direct replacement applications where restoring ride height control and front-end suspension response matters.

• Front left electronic air suspension strut assembly
• Fits 2009-2014 Mercedes-Benz CL550, front left, w/ Airmatic; Excludes Rear Wheel Drive; 4Matic (All Wheel Drive) Only
• Fits 2012-2013 Mercedes-Benz S350, front left, w/ Airmatic; Excludes Rear Wheel Drive; 4Matic (All Wheel Drive) Only
• Fits 2007-2013 Mercedes-Benz S550, front left, w/ Airmatic; Excludes Rear Wheel Drive; 4Matic (All Wheel Drive) Only
• Fits 2008-2011 Mercedes-Benz S450, front left, w/ Airmatic; Excludes Rear Wheel Drive; 4Matic (All Wheel Drive) Only
• OE-spec replacement for air suspension service on select Mercedes-Benz 4Matic models

Detailed Product Overview

This Unity air suspension strut is engineered for the front left corner of Mercedes-Benz vehicles equipped with Airmatic and 4Matic. Part number 28-113701 cross-references Arnott Industries AS-2853 and 4J-2028S for the same application. It is a practical replacement when the original electronic air strut is no longer maintaining proper ride control, height, or damping performance.

Compatible With 2009-2014 Mercedes-Benz CL550, 2012-2013 Mercedes-Benz S350, 2007-2013 Mercedes-Benz S550, and 2008-2011 Mercedes-Benz S450 in the front left position, this assembly supports the suspension system used on these models. The 28-113701 part number is a direct reference for shoppers searching for a front left Mercedes-Benz air suspension strut assembly.

Common Problems This Part Can Address

• Front-end sagging from a worn air strut
• Uneven ride height on the left front corner
• Air suspension noise or reduced damping performance
• Warning lights related to suspension height control
• Loss of ride comfort caused by a failing electronic air strut

Installation Notes

Verify the vehicle is equipped with Airmatic and 4Matic before ordering. This part excludes rear-wheel-drive applications and is specified for the front left position only. Confirm the existing strut configuration and match the vehicle by year, model, and drivetrain before installation.

Quality Assurance

Unity Automotive draws on decades of aftermarket suspension manufacturing and builds its suspension components to OEM specifications. The brand positions this Electronic Air Suspension Strut Assembly line around consistent fitment, dependable construction, and customer satisfaction.