Mercedes W639 Air Suspension Bag Air Bellows Set Left Right A6393280101

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W639 Air Suspension Bag Air Bellows Set Left Right is a complete set of components designed for the automatic level control system in this model, mounted on the right and left side of the vehicle. The set has been designed to maintain a stable vehicle ride height, improve driving comfort, and ensure predictable vehicle behavior under load. This solution is particularly beneficial for users who expect precise suspension performance in their Mercedes vehicle.

Specifications and technical data

• SKU: A6393280101-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6393280101
• Substitutable numbers: A6393280101, A 639 328 01 01
• Location on the vehicle: Right, Left
• Category: Self-Levelling Suspension Parts

Purpose and function in the suspension system

The air suspension bags in the Mercedes Vito W639 are responsible for maintaining the set vehicle ride height regardless of the vehicle load. They work in conjunction with the automatic level control system, which continuously corrects the position of the axle relative to the body, resulting in stable handling, predictable reactions on uneven surfaces, and better vehicle control when driving with cargo or passengers.

Placement on the right and left side of the vehicle allows for an even distribution of forces in the suspension system, reducing body roll and improving driving comfort in typical urban conditions and on the road. The use of pneumatics in this Mercedes model also supports the operation of safety systems, providing a more stable platform for the braking and traction control systems to function.

Benefits of using the air suspension bag set

Using a complete set of air suspension bags in the Vito W639 allows for consistent operation on both sides of the axle, which is essential for even component wear and maintaining predictable handling characteristics. In practice, the user gains:

• more stable vehicle height maintenance under variable loads,
• reduced body sway during maneuvers and driving over bumps,
• better tire contact with the road surface, which promotes braking efficiency,
• more comfortable vibration damping compared to a classic suspension without level control.

For commercial vehicles such as the Mercedes Vito, this is of particular importance with frequent changes in cargo weight, where stable suspension geometry affects safety and the predictability of the vehicle's behavior.

Integration with the automatic level control system

The Automatic level control category includes components responsible for maintaining the set vehicle height, and air suspension bags are one of the key components of this system. In the Mercedes Vito W639, they work with position sensors and control units that select the appropriate pressure in the bags based on the current load. As a result, the vehicle maintains a similar height regardless of the number of passengers or the weight of the cargo.

A properly functioning set of air suspension bags limits excessive suspension deflection, which helps maintain the correct working angles of the suspension and steering system. This has a direct impact on the durability of other components and on even tire wear, which in the long run translates into lower operating costs.

Selection and application in service practice

When choosing an air suspension bag set for the Mercedes Vito W639, it is worth paying attention to compatibility with the system installed at the factory in the specific vehicle. Using a set for both sides facilitates service, ensures consistent operating parameters, and avoids differences in damping characteristics between the right and left sides.

Such a solution is particularly recommended in situations where the vehicle is used intensively in local or intercity transport, as well as in versions adapted for passenger transport, where comfort and driving stability have a direct impact on passenger experience. The bag set can be used both for routine repairs and for planned suspension system upgrades to restore factory performance parameters.

If you are planning a comprehensive repair or upgrade of the suspension area with automatic level control in your Mercedes and need other elements from the same group, such as additional pneumatic sub-assemblies, control elements, or components working with the leveling system, check the available parts in the Automatic level control Mercedes category.

Technical support and service knowledge

When working with advanced systems in Mercedes vehicles, such as suspension with automatic level control, it is important to understand the cooperation between individual systems – including the drivetrain and transmission. For users who are planning broader service work on the vehicle, material discussing the specifics of operating and purchasing used drivetrain components may be helpful. In this context, it is worth reading the article Transmission: manual, automatic or DSG – typical faults and a guide to buying a used gearbox, which organizes knowledge on the selection and assessment of the technical condition of key drivetrain components.