I'm with Dave ... it is your fiver and your oilfield mindset, but ... you're making a lot of work for yourself in adapting down and up and possibly be mismatching the actuators. Both me and Dave can lock up all four at 45+ mph on dry asphalt with our 3/16" line if we were foolish enough to do so. The fittings on the calipers and actuator are made for regular double flare type brake lines. More adaptor fittings make more places for leaks. I would suggest sticking with industry standard material ... brake lines have been around for many years and have been made per design for a good reason. Giant stainless steel line and high dollar unique fittings to make it all work "just because" will be a foolish venture when the day is done. Cap off the well for now ....
