Mercedes Benz R350 Air Suspension Parts: A Complete Guide

If you own a Mercedes Benz R350, you know the ride quality is partly due to the advanced air suspension system. Over time, components wear out and need replacement. This guide covers the essential air suspension parts for the R350, common problems, and how to choose replacements wisely.

Understanding the R350 Air Suspension System

The Mercedes Benz R350 uses an AIRMATIC system with air springs (struts) at each wheel, a compressor, valve block, and various sensors. The system adjusts ride height and damping automatically based on load and driving conditions. Key parts include:

Air Struts (Springs)

Each corner has an air strut – a combination of a shock absorber and an air bag. Front struts often fail due to rubber bellows cracking, leading to air leaks. Rear struts can leak as well, causing the vehicle to sag on one side.

Air Compressor

Electric compressor with a piston and motor builds pressure. Common failures: internal moisture damage, burned-out motor, or faulty pressure sensors. Symptoms include slow lift or no adjustment.

Valve Block

Distributes air to each strut. Solenoids can stick or seals leak, causing uneven ride height.

Ride Height Sensors

Measure suspension travel; if faulty, the system may throw errors or fail to level.

Air Lines and Fittings

Plastic lines can crack, and O-rings leak at connection points.

Common R350 Air Suspension Problems

Owners report these frequent issues:

• Vehicle sagging overnight: Usually a leak in a strut or air line.
• Compressor running constantly: Leak in the system or faulty valve block.
• Check Engine Light / Suspension Warning: Often from ride height sensor faults.
• Rough ride: Failed strut or compressor not maintaining pressure.

Diagnosing requires a scan tool to read fault codes from the air suspension module.

Choosing Replacement Parts

OEM vs Aftermarket

• OEM: Same as factory – reliable but expensive. Recommended if you want certainty.
• OE: Parts made by the original manufacturer (like Arnott or Bilstein) but sold without Mercedes branding – often better value.
• Aftermarket: Varies widely. Brands like Arnott, Suncore, and Dorman offer remanufactured struts with good warranties. Avoid no-name parts; failures are common.

Key Components to Replace

Front Air Struts

Part numbers: Front left 2513200313, Front right 2513200413. Costs $300-$800 each depending on brand. Remanufactured struts with new airbags and seals are a practical option.

Rear Air Springs

Part number 2513200225. Common to fail at the bellows. Replace in pairs. Price $150-$400 each.

Air Compressor

Part number 2513200104. Consider Arnott or Bilstein reman units that are moisture-resistant. About $400-$600.

Valve Block

Located near the compressor. Often replaced as a unit. Part number 2513200258. $200-$350.

Ride Height Sensors

Often the plastic linkages break. Replace with OEM or quality aftermarket. $50-$100 each.

DIY vs Professional Replacement

Air suspension work can be done by experienced DIYers. Needs basic tools plus a scan tool to recalibrate ride height. Compressor replacement is straightforward. Changing struts requires spring compressors and care. If you’re not comfortable, a shop may charge $500-$1000 for labor plus parts.

Steps for DIY Strut Replacement (General)

1. Lift vehicle and support with jack stands.
2. Relieve air pressure from system (use scan tool or bleed valve).
3. Disconnect air line and electrical connector.
4. Remove bolts securing strut.
5. Install new strut, reconnect, and pressurize system.
6. Recalibrate ride height with scan tool.

Always replace O-rings when disconnecting air lines.

Final Recommendation

For most Mercedes R350 owners, the best approach is to replace failed parts with high-quality remanufactured units from brands like Arnott. Replace struts in pairs (both front or both rear) to maintain even handling. If your compressor is original and over 100k miles, proactive replacement can prevent future failure. Always fix leaks promptly – running the compressor constantly can burn it out. Consider converting to coil springs if air suspension is problematic, but understand that will change ride characteristics.

Maintain your AIRMATIC system: check fault codes with a scan tool during oil changes. With proper care, air suspension can last another 100k miles.