Mercedes W221 Automatic Brake Pedal Assembly Unit A2402900318

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W221 Automatic Brake Pedal Assembly Unit is an original braking control system component designed for premium vehicles of this series. The design, tailored for automatic transmissions, ensures precise transfer of the driver's pressure to the braking system and stable operation during daily use. Thanks to its factory origin from the Mercedes group, the correct mounting points and pedal operating geometry are maintained.

Specifications and technical data

• SKU: rhd-A2402900318-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2402900318
• Substitutable numbers: A2402900318, A 240 290 03 18, KD
• Gearbox type: Automatic
• Category: Pedal Assemblies, Pads & Parts

Purpose and compatibility with the automatic transmission system

The presented brake pedal assembly has been designed to work with the automatic transmission in the Mercedes W221 model. The appropriate pedal travel and resistance characteristics are adapted to the specifics of the automatic gearbox, where the brake also serves as a safety feature during gear selection and locking.

The factory design of the pedal assembly guarantees the correct position relative to the driver's seat and steering column, which translates into ergonomics and a repeatable, predictable braking feel. This is particularly important in luxury class cars, where comfort and control precision are key to driving safety.

Brake pedal assembly construction

The brake pedal assembly in the Mercedes W221 is a complete mounting unit, including the support body, pedal arm, and components interacting with the braking system and automatic transmission control. The modular solution facilitates the replacement of the entire assembly in case of wear or damage, without the need to interfere with the body structure.

The properly selected pedal lever ratio ensures a linear response to the driver's foot pressure, which promotes smooth braking force modulation. Stable mounting to the bulkhead and optimized arm geometry limit unwanted deflection and improve operational repeatability over a long period of use.

Benefits of using the original brake pedal assembly

Using the original brake pedal assembly in the Mercedes W221 allows for maintaining the factory performance parameters of the braking system and driving comfort. The most important advantages include:

• maintaining the correct pedal travel and resistance, consistent with the characteristics of the W221 class vehicle,
• a confident, repeatable braking feel, essential for city and highway driving,
• compatibility with factory mounting points and body components,
• consistency with the automatic transmission control system.

As a result, the driver receives a brake control system that performs according to the manufacturer's specifications, without compromises in terms of ergonomics and safety.

Category: Pedals, pedal pads and footrests

The element belongs to the Pedals, pedal pads and footrests group, i.e., components responsible for the driver's physical contact with the vehicle's control systems. The proper selection of this part has a direct impact on the comfort of operating the brake, foot stability on the pedal, and the precision of force modulation. Replacing the complete brake pedal assembly is recommended in situations where there is play, uneven resistance, or incorrect pedal position relative to other control elements.

If you are planning a comprehensive repair or upgrade of the brake control zone in your Mercedes and need other elements from the same group, such as additional pedal arms, pads, or driver footrests, check the available parts in the Mercedes Pedals, pedal pads and footrests category.

Condition and service application

The offered brake pedal assembly is a used item, which makes it an attractive service solution for post-accident repairs, replacing worn components, or restoring full functionality to the brake control system in a Mercedes W221. Choosing parts from this group allows for optimizing repair costs while maintaining the factory design and fitment for the specific model.

Before installation, it is recommended to perform a standard check of the mechanism's functionality, including the smoothness of the pedal arm movement and its interaction with the braking system and automatic transmission components, in accordance with the vehicle manufacturer's service procedures.

For users interested in a broader view of selecting drivetrain components and the relationship between control and transmission, the guide article on clutch diagnostics, dual-mass flywheels, and selecting drivetrain parts, which discusses practical aspects of servicing components that work with the drive system, may be helpful.