Brake Pad Sensor Mercedes W166 Rear Right O/S Brake Wear Wire Cable A1665405609

Brake Pad Sensor Mercedes W166 Rear Right O/S Brake Wear Wire Cable is an original electrical system component for the braking system, designed for installation on the rear right axle of Mercedes W166 series SUV vehicles. Thanks to its factory-fit design for a specific location on the vehicle, it ensures a secure electrical connection for the caliper and stable cooperation with the braking system electronics. This is a solution for users who expect consistency with the factory installation architecture and want to avoid compromises associated with universal replacements.

Specifications and technical data

• SKU: A1665405609
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1665405609
• Substitutable numbers: A1665405609, A 166 540 56 09
• Location on the vehicle: Rear, Right
• Category: Additional Brake Sensors & Switches

Purpose and function in the braking system

The presented wire harness is a component responsible for transmitting electrical signals between the brake caliper and the rest of the vehicle's installation in the rear right axle area. A correctly selected cable in this area is crucial for:

• stable operation of sensors and switches associated with the brake caliper,
• maintaining proper communication with control modules,
• preserving the factory operating logic of the braking system.

Thanks to its dedicated placement on the vehicle at the rear right side, the harness is optimized in terms of length, routing, and mounting method, which reduces the risk of abrasion, tension, and improper cable positioning.

Compatibility and fit for Mercedes W166

The harness has been designed with the W166 platform construction in mind, which translates into precise fitting with factory mounting points and appropriate routing within the rear axle area. This means that with proper selection based on the vehicle version and braking system, you can count on:

• easier installation without the need for system modifications,
• preservation of the original harness routing in the body and suspension,
• proper cooperation with existing brake sensors and switches.

Such a fit is particularly important in vehicles equipped with advanced safety systems, where the electrical integrity of the braking system has a direct impact on the operation of driver assistance functions.

Component characteristics and service application

As an element from the Other brake sensors and switches group, the rear right caliper wire harness acts as a connector between the mechanical part of the system and the vehicle's electronics. In service practice, it will prove particularly useful in situations where:

• the original harness has suffered mechanical damage (abrasion, tearing, connector corrosion),
• the vehicle has undergone post-accident repair in the rear axle area,
• it is necessary to restore the factory state of the installation after previous modifications.

Using an original cable in this location allows for reducing potential diagnostic errors associated with an unstable connection and facilitates subsequent service maintenance, as the system remains compliant with the manufacturer's documentation.

Condition, quality, and benefits of choosing a used component

The offered harness is a used item, which in practice means the possibility of obtaining a factory component at a more favorable price compared to a new part. For many Mercedes W166 users, this is a rational choice, allowing for the maintenance of a high level of compliance with the original while optimizing the costs of braking system repairs.

If you want to better understand how to safely and consciously choose used electrical system components and sensors, it is worth checking out the Global Parts guide – Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?, which discusses, among other things, selection by OEM numbers, compatibility issues, and practical installation tips.

Additionally, for those planning broader purchases of second-hand parts, a guide to used component offers available in the article Used parts – your guide to the best offers in the automotive store may be useful, helping to assess the cost-effectiveness and usage methods of such solutions.

Braking system expansion in Mercedes

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 harnesses, pedal position sensors, or switches related to brake operation, check the available parts in the Other brake sensors and switches Mercedes category.