Mercedes W212 Brake Wear Sensor Rear Wheel Pad Left Right N/O/S A2125401705

BMW E70 E71 Brake Pad Wear Sensor Rear A2125401705 is a precise component of the braking system that allows for continuous monitoring of the friction material's condition on the rear axle. Thanks to the solution used by Mercedes, the sensor ensures a stable warning signal and supports safe vehicle operation. It is a practical choice for drivers expecting a proven design and predictable braking system performance.

Specifications and technical data

• SKU: A2125401705
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2125401705
• Substitutable numbers: A2125401705, A 212 540 17 05, EM
• Location on the vehicle: Rear, Right, Left
• Category: Brake Cables

Purpose and Function of the Wear Sensor

The presented brake pad wear sensor is designed for installation on the rear axle, with the possibility of fitting on both the right and left sides. Its task is to transmit information about the critical wear of the pads to the vehicle's system, allowing for planned replacement of the pads before a drop in braking efficiency occurs. This type of solution reduces the risk of damage to the brake discs and helps maintain stable system operating parameters.

Construction and Vehicle Placement

The sensor belongs to the group of elements referred to as Brake Lines, meaning it is designed to operate in close proximity to the brake calipers and pads. Its placement on the vehicle covers the rear axle with the option of installation on both sides, which facilitates adaptation to the specific braking system configuration. This design allows for routing the cable in accordance with the factory wiring path, minimizing the risk of chafing and mechanical damage.

Benefits of Using the Original Mercedes Solution

Using a sensor from the Mercedes brand means employing a component designed for operation in the demanding environment of a braking system. The most important advantages include:

• stable transmission of the pad wear signal to the vehicle's system,
• predictable behavior under typical operating conditions,
• design adapted for operation near components exposed to high temperatures and road debris.

Thanks to this, the sensor can be used as a functional replacement in vehicles requiring precise monitoring of the rear axle pad condition.

Product Condition and Service Application

The offered item is in Used condition, making it an attractive option for users seeking an economical solution while maintaining the functionality required for everyday operation. This type of sensor is suitable for both standard pad replacements and more extensive service work on the braking system, where restoring full wear monitoring function is important.

Selection and Safety of Used Brake System Components

When choosing used brake system components, such as sensors, lines, or control elements, it is advisable to follow proven selection and inspection procedures. To better plan service and avoid unnecessary costs, a guide describing how to responsibly choose used brake system components will be helpful – you can find it in the article Used Brake System: How to Safely Choose Discs, Calipers, and ABS?.

Expanding Work on the Mercedes Braking System

If you are planning a comprehensive repair or upgrade of the braking zone in your Mercedes and need other parts from the same group, such as lines, sensors, or additional control sections, check the available parts in the Mercedes Brake Lines category.