Mercedes W447 Brake Speed ABS Sensor A4479053402

Mercedes W447 Brake Speed ABS Sensor is an original brake system component responsible for precise wheel speed reading and the proper operation of the ABS system. This Mercedes brand component allows for the restoration of correct functionality of electronic safety and vehicle stability systems. This used part is a sensible choice for drivers looking for a technically verified solution at an attractive price.

Specifications and technical data

• SKU: A4479053402
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A4479053402
• Substitutable numbers: A4479053402, A 447 905 34 02
• Category: Additional Brake Sensors & Switches

Function and role of the ABS speed sensor

The ABS speed sensor in Mercedes W447 models is responsible for generating a wheel speed signal, which is then analyzed by the brake system controller. Based on this data, the ABS system can modulate pressure in the brake circuits, limiting wheel slip during emergency braking. A properly functioning sensor also affects the operation of auxiliary systems, such as traction control or electronic stability control.

Benefits of using an original Mercedes sensor

Using an original sensor in a Mercedes vehicle ensures proper fitment to the hub and wiring harness, as well as compatibility with factory controller operating parameters. Thanks to this:

• the ABS system reacts predictably and stably in emergency situations,
• the risk of errors in the controller memory related to incorrect speed signals is reduced,
• consistency of safety system operation with the vehicle's original software is maintained.

For the user, this means more confident braking, better vehicle control, and a lower risk of unplanned service visits resulting from brake system electronics issues.

Characteristics of the item from the Other brake sensors and switches category

The presented sensor belongs to the Other brake sensors and switches group, which includes components that work with the hydraulics and electronics of the brake system. In practice, this means it is part of a broader system where correct communication between sensors, the controller, and actuators is essential. Proper selection of this component for a specific Mercedes W447 version is crucial for maintaining signal consistency and avoiding interference in ABS operation.

A used ABS speed sensor can be a particularly beneficial solution for maintenance repairs when the priority is to maintain the original vehicle specification while optimizing costs. Such components, sourced from dismantling, are often chosen by workshops specializing in the Mercedes brand as a technically safe alternative to new parts.

Condition, verification, and selection of the sensor

The offered sensor is in used condition, which in practice means it comes from an operated vehicle but has been verified for suitability for further installation. Before purchasing, it is worth comparing the design with the currently installed part and verifying compatibility with the vehicle's service documentation. A correctly selected sensor helps avoid problems with mechanical installation and electrical connection.

If you are considering broader use of aftermarket electronics, practical tips on selecting and testing such components may be useful – you can find them in the article Second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?, which discusses key aspects of safety and cost-effectiveness of such solutions.

Expanding the brake system in the Mercedes W447

If you are planning a comprehensive repair or upgrade of the braking zone in your Mercedes and need other elements from the same group, such as additional sensors, switches, or components working with the ABS system, check the available parts in the Other Mercedes brake sensors and switches category.

Such an approach allows for a consistent upgrade of the entire system – from the speed sensor, through other sensors, to control elements – which translates into stable brake system operation and predictable vehicle behavior in various road conditions.

Summary

Mercedes W447 Brake Speed ABS Sensor is a technically matched brake system component that restores proper cooperation of the ABS system with other safety modules. Choosing a used, original Mercedes brand component allows you to maintain the vehicle's factory operating parameters while reducing repair costs. It is a practical solution for drivers and workshops that value a solid, verified sub-assembly in the brake system.