Don't get confused and call it just copper line. It's not regular copper line (which you can buy in the hardware store) it's a alloy of copper. It bends easily but has the strength to withstand brake system use. During a panic stop, the brake pressure can spike over 2000psi. That's why you are not supposed to use compression fittings on brake systems also.Copper vs steel line is night and day difference
Copper line it’s wonderful you just bend it with little worry and flares great
Steel line you can kink it if you bend it the wrong way and I have a 50/50 success rate for steel flares
Weed whacker string is great to put in your brake line while bending to insure you don’t kink
I have never put one on facing the wrong direction, but I wouldn't even want to make a guess at how many times I have gotten it flared and realized completely forgot to put the fitting on.Good advice. Props to you for admitting it. To be honest, I may not admit it if I did that.