TL;DR: A day after inspection, my f**king brake stopped working.
I had my 2015 GTI inspected in early March 2018, which included exchanging brake fluid. Merely a day after when I was driving on the mountainous section of Skyline Blvd, the brake suddenly became ineffective. I pulled over right away and had my car towed back. Photos of the brake and the dashboard: imgur.com/a/55n3h
The root cause was that the brake fluid leaked due to human mistake and Boardwalk VW did quickly fix the problem and reimbursed my tow expense. So one star for that. That said, fatal mistakes like this can get me killed so it's really a shame. It's a xxxx moving vehicle you are working on so if your mistake kills people and destroy families.