Description
Mercedes W204 Front Right Brake Pad Wear Sensor is a precise component of the braking system that monitors the condition of the friction linings on the front right axle of the vehicle. Thanks to it, the driver receives clear information about the necessity of replacing the pads, which supports safe and predictable operation of the car. The offered sensor comes from the Other brake sensors and switches group, allowing for its informed selection within the entire braking system.
Specifications and technical data
- SKU: A2045400005
- Mark: Mercedes (Genuine OE)
- Condition: Used
- OEM Part Number: A2045400005
- Substitutable numbers: A2045400005, A 204 540 00 05, BG
- Location on the vehicle: Front, Right
- Category: Additional Brake Sensors & Switches
Function and application of the wear sensor
The brake pad wear sensor for the right front axle is responsible for constant monitoring of the friction lining thickness. Upon reaching the limit wear level, it generates a signal to the vehicle’s electrical system, which is then displayed on the instrument cluster. This solution allows you to:
- plan brake pad replacement in advance,
- minimize the risk of brake disc damage,
- maintain stable braking performance in daily driving,
- ensure compliance with the factory logic of the warning system in the Mercedes W204.
Compatibility and fit for the braking system
The presented sensor has been designed specifically for operation on the front right side of the vehicle, which guarantees proper wire routing and correct connection to the electrical harness. The appropriate shaping of connectors and mounting points allows for installation in original holders, without the need for modifications to the system. This ensures:
- correct wire routing within the caliper and steering knuckle,
- mounting stability under vibration and variable temperature conditions,
- consistency with the factory onboard diagnostic system.
Product characteristics and condition
The sensor belongs to the Other brake sensors and switches group, meaning it works with other electrical components responsible for signaling and control within the braking system. The item is used, which in practice means that before re-installation, it is advisable to verify the condition of the connectors, wire insulation, and mounting points for any signs of wear. A correctly selected and functional sensor allows for maintaining the functionality of the pad wear warning system at a level close to factory solutions.
Importance of correct selection and installation
To ensure full compatibility with a specific version of the Mercedes W204, it is recommended to select the sensor based on vehicle data and manufacturer markings. Proper matching translates to:
- seamless integration with the existing electrical harness,
- correct operation of the pad wear indicator on the dashboard,
- maintaining predictable braking system response in road conditions.
For users who want to consciously select used electronic components and sensors, a guide discussing the rationale for using second-hand parts, selection by markings, and installation issues will be useful – details can be found in the article Used car electronics on board – why choose used ECU modules and sensors?.
Expanding the braking system in a Mercedes
If you are planning a comprehensive repair or upgrade of the braking area in your Mercedes and need other parts from the same group, such as additional sensors, switches, or electrical system components, check the available parts in the Other Mercedes brake sensors and switches category.
When selecting components for a specific body version and engine, it can also be helpful to use vehicle identification numbers and manufacturer markings – practical step-by-step tips can be found in the guide how to select the correct car part by VIN and OEM number, which makes it easier to choose the right brake pad wear sensor for your Mercedes W204.
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