One problem related to brake sensor has been reported for the 2018 Audi TT. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2018 Audi TT based on all problems reported for the 2018 TT.
The brake system on this car is not vented properly and thus overheats under heavy braking, resulting in excessive wear, melting of electronics, and potentially catastrophic failure which could result in injury or death. I know a number of people with this same model car who have had similar issues, and I have read reports of people across the us with the same problem. In my case I was on a closed circuit driving at a high-performance driving school and the brakes failed without warning because the pad sensor warning system had failed and the excessive heat wore through the brake pads very quickly.