BMW 1 3 Series E81 E87 E90 E90N E92 E93 LCI Brake Pad Wear Sensor Rear 6789445

The BMW 1 and 3 Series Rear Brake Pad Wear Sensor is a component designed for precise monitoring of the brake pad condition on the rear axle in selected BMW E81, E87, E90, E90N, E92, and E93 LCI models. This sensor, sourced from a dismantled vehicle, ensures factory geometry, proper fit for installation, and correct cooperation with the brake pad wear monitoring system in the car. It's a practical solution for users who want to maintain the efficiency of the braking system while keeping service costs reasonable.

Specifications and technical data

• SKU: 6789445
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6789445
• Substitutable numbers: 34356789445, 6789445, 34356762253, 6762253
• Location on the vehicle: Rear
• Category: Brake Pad Wear Sensors

Purpose and Compatibility

The presented sensor is dedicated to the rear axle of the vehicle, meaning it works with brake pads installed on the rear calipers. The connector design and cable length are adapted to the factory wiring harness routing in the 1 and 3 Series E generation bodies, ensuring a tidy installation that aligns with the original BMW design. Using an original solution helps maintain the correct operation of the wear indicator on the instrument cluster and avoids issues with error messages in the onboard system.

Construction and Principle of Operation

The brake pad wear sensor operates based on a signal wire embedded in the friction material. This wire is interrupted when the pad lining reaches its minimum thickness. The vehicle's control unit interprets this change as a signal indicating the need for pad replacement and displays the relevant information to the driver. Thanks to this solution, the braking system is continuously monitored, allowing the user to schedule service before excessive wear of the friction components occurs.

The original geometry of the mounting tabs and the correct profile of the wire facilitate proper positioning of the sensor in the brackets and guides on the control arm and caliper, reducing the risk of chafing and mechanical damage during operation.

Installation and Operation

Replacing the rear axle brake pad wear sensor is a service procedure most commonly performed concurrently with the installation of new brake pads. In practice, this involves:

• removing the old sensor from its holders and caliper,
• connecting the plug to the factory electrical socket,
• routing the wire according to the original mounting points,
• inserting the sensor tip into the brake pad socket.

By using a component from the same BMW construction family, you minimize the risk of fitting issues and ensure stable operation of the wear monitoring system in the long term. Although used, the sensor remains a functional component that allows for the restoration of full brake pad wear signaling after braking system repair.

Benefits of Using an Original BMW Sensor

Using an original brake pad wear sensor in the BMW 1 and 3 Series offers a number of practical benefits:

• Full integration with vehicle electronics – correct cooperation with the diagnostic system and dashboard indicators.
• Proper fit for wiring harness routing on the rear axle – no need for installation modifications.
• Reduced risk of false brake pad wear messages due to maintained factory operating parameters.
• Possibility of economical braking system repair while preserving the original BMW design concept.

For users who consciously choose used electronic components and sensors, the Global Parts guide on selecting and installing such components will be a valuable addition to their knowledge – find details in the article Used Car Electronics Onboard – Why Choose Second-Hand ECU Modules and Sensors?.

Other BMW Brake Pad Wear Sensors

If you are planning comprehensive brake system service for your BMW and are considering replacing other pad condition monitoring elements as well, it is worth analyzing the available solutions within the same product group. This allows you to select components with similar specifications and origin, which will help maintain service consistency for your vehicle and optimize operating costs. To view the full offer, including different mounting variants and solutions for other models of this brand, check the available parts in the BMW Brake Pad Wear Sensor category.

Summary

The BMW 1 3 Series E81 E87 E90 E90N E92 E93 LCI Brake Pad Wear Sensor Rear is a practical choice for drivers who want to restore proper operation of the rear axle pad wear signaling without abandoning the manufacturer's original design concept. A used, functional sensor allows for maintaining control over brake pad condition, supports driving safety, and represents a reasonable compromise between cost and functionality in the daily operation of the BMW 1 and 3 Series.