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

Mercedes-Benz S-Class W221 Air Suspension Pressure Reservoir Tank is an original pneumatic system component designed for installation in the rear of the vehicle. It ensures stable storage of compressed air, which translates into predictable operation of the suspension and other pneumatic consumers. Thanks to its factory origin, it is precisely matched to the body structure of the W221 generation S-Class, which facilitates installation and subsequent operation.

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 Mercedes-Benz S-Class W221 Air Suspension Pressure Reservoir Tank acts as a reservoir for the compressed medium in the air suspension system and related systems. The appropriate capacity and design of the tank allow for:

• maintaining stable operating pressure in the rear of the vehicle,
• reducing the frequency of compressor activation,
• smoother suspension response to load changes and road irregularities.

Its placement in the rear zone promotes optimal routing of pneumatic lines and improves the balance of the entire system.

Design, fitment, and installation

The original design of the tank is engineered specifically for the W221 platform, which means compatibility with factory mounting points and installation routing. Thanks to this:

• installation is orderly, without the need for body modifications,
• it is easier to maintain proper routing of pneumatic lines,
• the risk of leaks resulting from improper fitment is minimized.

Dedicated placement on the rear axle promotes even load distribution of the structure and facilitates service during subsequent suspension system inspections.

Benefits of using an original air reservoir tank

Using a factory tank in a Mercedes S-Class W221 translates into a number of practical operational advantages:

• maintaining suspension performance characteristics in accordance with the manufacturer's specifications,
• better cooperation with the factory pneumatic system control,
• reducing the risk of pressure problems and system errors resulting from unsuitable replacements.

The original component also provides greater predictability of vehicle behavior during changes in driving modes as well as during dynamic braking and acceleration, where rear axle stability is crucial for comfort and safety.

Characteristics of the used product

The presented air reservoir tank is a used part, sourced from dismantling. This type of component, while maintaining tightness and proper structure, can still ensure the correct operation of the pneumatic system for a long time. Choosing a used, original sub-assembly allows you to:

• reduce repair costs compared to a new part,
• maintain compliance with the vehicle's factory specifications,
• preserve the high material quality typical of the Mercedes brand.

This solution is particularly beneficial for comprehensive work on the air suspension, where the number of replaced elements may be higher.

Technical support and additional materials

When selecting pneumatic system components, it is worth using reliable sources of knowledge and proven parts. If you are interested in comparing solutions used in high-performance cars and want to better understand the relationships between the engine, brakes, and chassis, check out the article Audi RS vs other models – what is hidden under the hood and chassis?, which shows how important the consistency of the entire running gear is.

If you are planning a comprehensive repair or upgrade of the chassis area in your Mercedes and need other elements from the same group, such as additional tanks, mounts, or lines, check out the available parts in the Other Mercedes category.