And isn't the RV trike steered using brakes? Castering nosewheel?Context matters. Carts, ULs, Bush planes, etc are typically open wheel designs with short duty cycles and/or low energy requirements. RVs are typically heavier ( higher energy), frequently faster (again, higher energy), and the brakes are typically inside an insulated container (wheel pant).
As I mentioned earlier, check out the nylon air brake tubing. Go to a big-truck dealer's parts department, or a farm equipment dealer. The black stuff is most UV-resistant, but it comes in other colors too. Air brakes are critical systems, used on buses and big trucks at 70 MPH on crowded highways, and that tubing had better last for years running along the frame out in the sun and wind and snow and ice and salt and dirt, and in the hot engine compartment. It's way better stuff than Home Depot tubing. Go here: 90924 100 ft. DOT Approved Nylon Air Brake Tubing, 1/4 in. O.D., Black | Imperial SuppliesThe main reason I wanted to use Nylaflow is the ease with which I can snake it through the airframe. Plumbing it with aluminum sounds like a major project.
I'm thinking as long as it is protected from the heat and the sunlight the Nylaflow should be okay.
It works fine for a lot of lighter homebuilts. Working pressure of 150 PSI assumes a constant pressure, while braking is very intermittent. Burst of 1200 is way beyond most aircraft brake pressures, including a Cessna's. I had that tubing on my Jodel for 20 years without any problems. It held even when I used my park brake that could put an awful lot of pressure into the system.The working pressure as well as the rupture pressure is too low on the Nylon air brake tubing.