Mercedes-Benz discovered that some of their 2019-2020 model vehicles have brake warning lights that are slightly smaller than required by safety standards. After filing a report, they asked the National Highway Traffic Safety Administration (NHTSA) to decide if this issue is minor and doesn't affect safety. NHTSA agreed with Mercedes-Benz, stating that the smaller size of the warning lights doesn't significantly impact safety, as they are still visible and correctly convey their message. Therefore, Mercedes-Benz does not need to alert customers or fix the issue for free.
Simple Explanation
Mercedes-Benz had some cars where the brake warning lights were a little small, but the people in charge checked and decided it's not a big deal because you can still see the lights clearly. So, Mercedes-Benz doesn't have to tell car owners or fix the small lights for free.