Mercedes W221 Rear Wishbone Thrust Brace Arm Carrier Right O/S A2213501806

Mercedes W221 Rear Wishbone Thrust Brace Arm Carrier Right O/S is a component from the Control arms and ball joints category, designed for the rear axle in petrol-engine vehicles. Engineered as a load-bearing suspension arm, it stabilizes the wheel geometry on the right side, improving handling precision and predictable vehicle behavior.

Specifications and technical data

• SKU: A2213501806
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2213501806
• Substitutable numbers: A2213501806, A 221 350 18 06
• Location on the vehicle: Rear, Right
• Fuel type: Petrol
• Category: Control Arms, Ball Joints & Assemblies

Purpose and function in the suspension system

The presented control arm is dedicated to the rear axle on the right side in high-end Mercedes W221 models with a petrol engine. As a structural element of the multi-link suspension, it is responsible for:

• maintaining a stable wheel position relative to the body during acceleration, braking, and cornering,
• transferring loads from the wheel hub to the body in a controlled manner,
• maintaining correct toe-in and suspension operating angles under various loads.

As a result, the chassis maintains proper stiffness, and the car handles confidently both in city driving and at higher highway speeds.

Construction and technical characteristics

The control arm has been designed as a load-bearing suspension arm that works in conjunction with ball joints and other system components. The construction is optimized for:

• resistance to dynamic loads typical for heavier luxury class limousines,
• compatibility with the factory suspension geometry of the Mercedes W221,
• precise wheel guidance in the vertical and horizontal planes.

As an original Mercedes component, the control arm is matched to factory mounting points, which facilitates installation and reduces the risk of incorrect suspension alignment after replacement.

Application in petrol vehicles

The suspension system in petrol versions of the W221 is designed with consideration for the specific weight distribution and operating characteristics of the powertrain. The Mercedes W221 Rear Wishbone Thrust Brace Arm Carrier Right O/S works with other arms and ball joints to:

• maintain body stability during rear axle load changes,
• reduce unwanted wheel movement during rapid acceleration,
• ensure predictable vehicle response to steering inputs.

The proper condition of this component has a direct impact on ride comfort, the efficiency of power transfer to the road surface, and even tire wear.

Condition, fitment, and installation

The offered control arm is a used part, which allows for an economical suspension repair while maintaining the manufacturer's original specifications. The element is intended for installation in place of the factory arm on the right side of the rear axle, using the original mounting points.

After installation, it is recommended to perform a wheel alignment to fully utilize the suspension's potential and restore the vehicle's correct handling parameters. A properly selected and installed control arm reduces play in the system, improves driving stability, and supports even loading of other suspension components.

Technical support and knowledge expansion

To better understand the role of control arms in the chassis system and the relationships between shock absorbers, suspension arms, and stabilizers, it is worth consulting our guide material. Practical information can be found in the article Suspension system – a comprehensive guide to shock absorbers, control arms, and stabilizers, which discusses the importance of these components for safety and ride comfort.

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 additional arms, ball joints, or brackets, check the available parts in the Mercedes control arms and ball joints category.