ABS Sensor Mercedes Vito W639 Brake Axle Suspension Rear Right O/S A6395402217

ABS Sensor Mercedes Vito W639 Brake Axle Suspension Rear Right O/S is a component from the ABS speed sensor category, designed for operation in the rear right part of the chassis. It enables precise reading of wheel rotational speed, which is crucial for the proper functioning of the anti-lock braking system and electronic stability control. This is a practical solution for users who want to restore the correct operation of the electronics responsible for braking safety in the Mercedes W639.

Specifications and technical data

• SKU: A6395402217
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6395402217
• Substitutable numbers: A6395402217, A 639 540 22 17, BG
• Location on the vehicle: Rear, Right
• Category: ABS Speed Sensors

Function and role in the braking system

The ABS speed sensor on the rear right axle is responsible for generating a wheel speed signal, which is then sent to the ABS/ESP system controller. Based on this data, the vehicle's electronics regulate the pressure in the braking system, limiting wheel lock-up during emergency braking and supporting vehicle stability on slippery surfaces. A functional sensor in this position helps reduce the risk of extended braking distances and prevents the ABS system from malfunctioning.

Purpose and fitment for the Mercedes W639

The presented sensor has been prepared for use in models from the Mercedes W639 family, in the rear – right side position. The placement on the vehicle is important both from the point of view of installation and the correct interpretation of the signal by the controller. Proper selection of the component for the specific mounting location reduces the risk of system errors, ABS/ESP warning lights, and uneven braking system operation.

Characteristics of the used component

The offered sensor is in used condition, meaning it comes from disassembly, and its operating parameters have been verified for suitability for further use. This type of solution is cost-effective while allowing for compliance with the vehicle's factory specifications. A used component from the original production line is often a reasonable compromise between price and build quality and fitment for the Mercedes installation.

Benefits of using a functional ABS speed sensor

Replacing a faulty ABS sensor on the rear right axle brings a number of measurable effects:

• restoration of proper ABS and electronic stability control system operation,
• reduction of wheel speed-related errors stored in the controller's memory,
• more stable vehicle behavior during emergency braking,
• reduction of wear on other braking system components resulting from incorrect pressure regulation.

For users who operate their Mercedes in demanding conditions, a functional ABS speed sensor is an important element in maintaining predictable vehicle behavior.

Selection, diagnostics, and practical tips

Before installation, it is worth verifying whether symptoms such as an illuminated ABS warning light, stability system error messages, or uneven brake operation are indeed caused by a failure of the sensor on the rear right axle. Computer diagnostics are helpful, as they allow for pinpointing the specific location of the problem. During installation, pay attention to the correct routing of the cable and the cleanliness of the socket and impulse ring to ensure a stable signal reading in the long term.

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 the available parts in the Mercedes ABS speed sensor category.

For drivers considering the installation of a used sensor and other electronic components, a guide describing selection by identification numbers, compatibility issues, and practical installation examples may be helpful – you can find it in the article Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?.