Yes, I know it is a banjo fitting. I'm not that young!
Good to hear it went together correctly, then. Last time I had the calipers off was to do pads, and that was probably ten years ago. I have never cracked the hydraulics for the front, though, so someone left out that bottom washer.
I didn't think I was going to get it apart. The hex was slipping in the fitting, and I was worried about rounding it out. So, I grabbed my electric impact that I had brought along for the wheel, and it came out instantly. I love power tools...
So... who wants to come by and help me build another three car garage? lol