You can see the bubbles
Installed Nylaflow brake lines an a customerís Pitts many years ago. I liked how easy it was to snake the tubing around the inside of the airplane and the landing gear. When I bled the system, I got good, normal brakes with no problems, but I could see a few bubbles thru the plastic. OK, just out of curiosity, I fooled with it until I got all the visible air out. The brakes were rock solid, which led me to wonder how much air Iíve been leaving in brake systems in the past that I could not see. I never heard any more about the airplane so I have no info on the long range results.
I WAS CAREFUL to use actual Nylaflow tube since the burst rating in regular nylon tubing is much lower, especially when it gets warm, like inside the wheel fairing. I think Nylaflow is OK, but Iíd never want to run it inside a wheel fairing unless there was some kind if cooling arrangement there. Our RV-6 has aluminum and AN plumbing. Iíve toyed with using Nylaflow inside the fuselage just to save a bit of weight and clutter, but couldn't figure out an easy way to transition to AN fittings downstream. Oh well, itís Ďway low priority.