David, it was aluminum tubing which is what's called for on the RV-6A brake system.  However, in hindsight - thinking about the low fatigue life of flexing aluminum, I think there are better choices.

 

Ed

Ed,

 As an ex-racer I must admit that I have been constantly appalled by the state of GA aircraft braking systems! I have done programs on brake systems at my EAA chapter advising against the solid tube brake setups. The only thing I find worse is the nylon tubing included in some of the kits! I would not use these systems on a kiddie go-kart. I have constantly been told by many of my fellow builders that the pressure in aircraft brakes is "low". Or aircraft brakes don't see as much action as car or motorcycle brakes. My response has always been, "It only takes one failure to ruin your whole day." I am truly sorry you had to be the poster boy for what I've been harping about.

 You can use solid tube for almost the entire system. One needs only a short flex line on both ends to ensure proper operation. Earls and aeroquip both make a transition fitting so you can run the ss braided line for only a foot or so on each end. Don't compromise here guys! Bill Randolf the guy who flew his RV-8 around the world was stranded in Tahiland for 2 weeks due to an almost identical brake failure. He had the same brake fire, and when the plane spun on the runway he lost both tires. (standard gear) Be careful with the brakes.

Bill Jepson