Description
Product Overview
The A-Premium Brake Wear Sensor is engineered for modern Audi models, delivering precise wear monitoring through a digital output. Constructed from a high‑grade blend of plastic and metal, the sensor resists corrosion and mechanical stress while maintaining a lightweight profile of just 0.07 kg. It operates on a 12 V DC supply and provides a clear digital signal when the brake pad thickness reaches the 10‑25 mm range, with a maximum sensing distance of 25 mm. The flange‑mount design ensures a secure fit on the front left brake caliper, and the oval‑shaped two‑pin connector simplifies wiring. Certified as a direct OE replacement (OEM numbers 4M0615121R, 4M0615121AB, 4M0615121S, SW0324), it matches the original specifications for length, connector dimensions, and voltage tolerance.
Usage
Designed for daily commuters and performance drivers alike, this sensor excels in city traffic, highway cruising, and spirited driving where brake wear can accelerate quickly. Install it on compatible Audi models such as the A4, A5, Q5, Q7, S4, S5, and related variants from 2017‑2020. Once installed, the sensor continuously monitors pad thickness and sends a digital alert to the vehicle’s onboard diagnostics, prompting timely pad replacement and maintaining optimal braking performance. 
Why Choose Us
A-Premium stands behind every sensor with a one‑year unlimited‑mileage guarantee, reflecting confidence in material quality and manufacturing precision. Our sensors undergo rigorous testing for voltage stability, temperature resilience, and mechanical durability, ensuring they meet or exceed OEM standards. The combination of plastic and metal offers the perfect balance of strength and weight, reducing strain on the caliper while preventing premature wear. Additionally, the direct plug‑in design eliminates the need for complex rewiring, saving time and reducing installation errors.
Key Features
- Durable plastic‑metal construction for long‑term reliability
- Digital output compatible with Audi’s onboard diagnostics
- Flange‑mount design for quick, tool‑free installation
- Accurate wear detection from 10 mm to 25 mm pad thickness
- One‑year unlimited‑mileage warranty for peace of mind
FAQ
Is this sensor compatible with all Audi models?
The sensor fits front left brake calipers on Audi A4, A5, Q5, Q7, S4, S5, and related models from 2017‑2020. Always verify the rotor size (350 mm × 34 mm) and part numbers before purchase.
How does the digital output work?
When the brake pad wears down to the preset threshold, the sensor sends a 12 V DC digital signal to the vehicle’s ECU, triggering a warning light on the dashboard.
Can I install the sensor myself?
Yes. The flange‑mount design and two‑pin oval connector allow a DIY installation with basic hand tools. Follow the included wiring diagram for a secure connection.
What warranty does A-Premium provide?
We offer a one‑year unlimited‑mileage warranty covering any manufacturing defects. Contact our support team with the purchase receipt for a replacement.
Will the sensor affect brake performance?
No. The sensor is lightweight and mounts externally, so it does not interfere with brake caliper operation or pad contact.
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