Mercedes-Benz S-Class W221 Air Suspension Pressure Reservoir Tank A2213200015

Mercedes-Benz S-Class W221 Air Suspension Pressure Reservoir Tank is a specialized pneumatic system component designed for installation in the rear suspension of this model. It is responsible for the safe storage of compressed air, which translates into stable suspension operation and predictable vehicle handling. Thanks to the use of an original design dedicated to the W221, the tank ensures consistency with the factory system architecture and proper cooperation with other pneumatic components.

Specifications and technical data

• SKU: A2213200015
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2213200015
• Substitutable numbers: A2213200015, A 221 320 00 15, BG
• Location on the vehicle: Rear
• Category: Other Steering & Suspension Parts

Purpose and function in the pneumatic system

The presented air reservoir tank is a component of the air suspension system located in the rear axle area. Its task is to store compressed air supplied by the compressor and stabilize the operating pressure in the system. In practice, this translates into:

• maintaining the correct vehicle ride height under varying loads,
• efficient suspension response to height adjustments,
• reduced compressor load due to the air reserve,
• more uniform operation of the entire pneumatic system.

Its placement in the rear of the vehicle helps optimize the airflow path to the suspension components, which promotes stability and repeatability of operating parameters.

Compatibility and fitment for the Mercedes W221

Mercedes-Benz S-Class W221 Air Suspension Pressure Reservoir Tank has been designed with the body structure and suspension system of this S-Class generation in mind. This means maintaining factory mounting points, proper routing of pneumatic lines, and compatibility with the suspension controller's operating characteristics. As a result:

• installation is based on original mounts,
• there is no need to modify the pneumatic system,
• compatibility with factory vehicle settings is maintained.

Such fitment is particularly important in luxury class vehicles, where ride comfort and suspension response precision are key to the experience of the driver and passengers.

Performance characteristics of the used component

The offered air reservoir tank comes from the secondary market, which allows for reduced service costs while maintaining the original design. In practice, this means the ability to restore the efficiency of the pneumatic system without having to resort to aftermarket replacements with uncertain parameters. A used component of this type is particularly attractive in situations where:

• a quick replacement of a damaged tank is necessary,
• compliance with factory specifications is important,
• optimizing the repair budget while maintaining OEM quality is a priority.

Choosing an original component from the secondary market helps maintain the consistency of the entire suspension system, which is important for both comfort and the durability of other sub-assemblies.

The importance of proper air reservoir selection

Selecting the correct air reservoir tank for a specific version of the Mercedes W221 has a direct impact on the safety and predictability of the suspension operation. An incorrectly selected component can cause:

• incorrect pressure in the pneumatic circuits,
• increased compressor load,
• uneven operation of the suspension air springs.

Using a dedicated tank designed for the rear of the vehicle reduces the risk of such problems and facilitates the diagnosis of potential faults in the future. This solution is particularly beneficial for workshops specializing in air suspension service and for users who expect stable system operating parameters.

If you are planning a comprehensive repair or upgrade of the rear suspension area in your Mercedes and need other elements from the same group, such as pneumatic lines, air springs, or compressors, check the available parts in the Other Mercedes category.

Technical support and knowledge about suspension systems

When working with advanced chassis systems, it is worth using reliable sources of knowledge regarding structural differences between individual model versions and their high-performance variants. In the context of analyzing solutions used in premium cars, an article describing the construction of engines, brakes, and chassis in sports variants may be helpful, available at the link Audi RS vs other models – what is hidden under the hood and chassis?. It allows for a better understanding of how manufacturers design components responsible for vehicle handling and stability.