Front Brake Pad Wear Sensor – Mercedes E & S Class (A2015400317)

The front brake pad wear sensor (OEM A2015400317) is a genuine-equivalent Mercedes-Benz component designed to monitor the wear level of your vehicle’s brake pads and notify the driver when replacement is needed. Installed on the front axle, this wear sensor connects to the brake pad and sends a signal to the instrument cluster once the friction material reaches its minimum safe thickness. Replacing worn sensors when fitting new brake pads helps maintain braking performance and ensures early warning for continued safe operation.

OEM Number: A2015400317, 2015400317

Placement on Vehicle : Front Left OR Right

Length : Apprx. 180 mm

Brake Type : Disc Brake

Our SKU: TM2015400317_313

All our Front Left Or Right Brake Pad Wear Sensor Fits Mercedes E, S Class A2015400317 are OEM quality and reliable after market car parts. This Front Left Or Right Brake Pad Wear Sensor Fits Mercedes E, S Class A2015400317 is specifically compatible with Mercedes-Benz: 124, 190, E-Class, S-Class, Saloon, .

Please use our make-model-year tool to check this part's compatibility with your vehicle. However, please note that our tool is for reference only and we recommend that you check the part number on your old unit prior to purchasing.

If you are still not sure about the compatibility of this part to your vehicle, please supply us with the VIN number or Reg number in our live chat or contact form! You can also find details on our purchasing & shipping guide here.

Key Benefits

Accurate Wear Monitoring
This sensor reliably detects brake pad wear on the front axle and sends a visual warning to your dashboard, helping you service braking components before they compromise performance.

Direct OEM-Match Fitment (A2015400317)
Designed as a direct replacement for Mercedes-Benz part number A2015400317, it fits exactly where the original sensor sits without need for modification.

Improves Brake Safety
Brake pad wear sensors play a critical role in safety by alerting you to worn pads early, which can prevent reduced stopping power and uneven braking. 

Ideal with Brake Pad Replacement
When brakes are serviced, the original sensor is often damaged or worn — replacing it at the same time ensures continuous monitoring. 

Front Left & Right Compatibility
This wear sensor can be installed on either the left or right front brake pad, making it a versatile choice for brake servicing.

Frequently Asked Questions (FAQs)

Q: What does a brake pad wear sensor do?
A: It detects the thickness of brake pads and triggers a dashboard warning when the pad material has worn down to a level requiring replacement.

Q: Why is it important to replace the sensor when changing brake pads?
A: Wear sensors often break or wear out as pads wear; replacing them with new pads ensures proper system warnings for future maintenance cycles.

Q: Is this sensor a direct fit for my car?
A: Yes — when your vehicle uses the A2015400317 reference, this sensor is a direct OEM-equivalent replacement and installs in place of the factory unit.

Q: Which vehicles typically use this part?
A: This part number is used across many Mercedes-Benz E-Class and S-Class models, often on classic platforms such as W124, W126, S124, and related diesel & petrol variants. Always check fitment by VIN or existing part reference.

Q: Can the wear sensor be fitted myself?
A: Many DIYers can replace brake wear sensors during a brake pad change, but professional installation ensures the sensor and connector are correctly routed and secured.