Mercedes W251 ABS Speed Sensor Brake Pad Cable Front Rear Axle A2515400817

Mercedes W251 ABS Speed Sensor Brake Pad Cable Front Rear Axle is a precision safety system component responsible for accurate wheel speed readings and the proper operation of the ABS system. Thanks to its factory-fit design for Mercedes W251 series models and the ability to be installed on both the front and rear axles, this sensor is a functional service solution for brake system repairs. It is a practical choice for workshops and users who expect stable integration with the vehicle's electronics without the need for installation modifications.

Specifications and technical data

• SKU: A2515400817
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2515400817
• Substitutable numbers: A2515400817, A 251 540 08 17
• Location on the vehicle: Front, Rear
• Category: ABS Speed Sensors

Purpose and function in the ABS system

The ABS speed sensor is responsible for generating a wheel speed signal, which is then analyzed by the anti-lock braking system controller. A properly functioning component allows for:

• maintaining vehicle stability during emergency braking,
• precise modulation of braking force by the ABS system,
• reducing wheel slip and improving traction in difficult road conditions,
• cooperation with other electronic vehicle systems that rely on wheel speed data.

In the event of faults such as an illuminated ABS warning light, increased braking distance, or unstable operation of assistance systems, replacing the ABS speed sensor is one of the fundamental diagnostic steps.

Compatibility with Mercedes W251 and positioning

The presented sensor has been designed for Mercedes W251 series vehicles, ensuring proper geometric fit and electrical compatibility with the factory installation. The component can be used on both the front and rear axles, which facilitates part selection for repairs involving more than one wheel.

Such a solution allows for:

• simplifying parts logistics in the workshop,
• maintaining component consistency within a single vehicle,
• reducing the risk of installing an incorrect sensor with different operating parameters.

Performance characteristics and advantages of use

As a component in the ABS Speed Sensor category, this product has been developed for stable cooperation with the braking system and onboard electronics. Key benefits of using this type of sensor in a Mercedes W251 include:

• signal consistency with the requirements of the ABS controller,
• maintaining the factory performance characteristics of safety systems,
• reducing diagnostic errors related to incorrect wheel speed readings,
• the ability to use existing mounting points and cable routing.

The product belongs to a group of parts originally designed for the Mercedes brand, which helps maintain predictable vehicle behavior after repair and facilitates subsequent computer diagnostics.

Condition, selection, and installation aspects

The sensor is offered as a used component, which allows for economical repair while maintaining compliance with the vehicle's factory specifications. Before installation, standard service procedures are recommended, such as checking the connection socket, cleaning the mounting surface on the steering knuckle or hub, and verifying the wiring harness for mechanical damage.

To select the correct sensor for a specific vehicle, it is worth using the OEM part number or replacement numbers and vehicle data. Detailed tips on selecting used modules and sensors, including the verification procedure by part numbers, can be found in the Global Parts guide: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?

Support for ABS system expansion in Mercedes

If you are planning a comprehensive repair or upgrade of the braking zone in your Mercedes and need other components from the same group, such as additional sensors, signal cables, or mounting elements, check out the available parts in the Mercedes ABS Speed Sensor category.

To maximize the potential of dismantled parts and reduce the risk of premature wear, it is worth familiarizing yourself with practical tips on operation and maintenance described in the article How to extend the life of used car parts?