63 Dart, brake line

As amx said, 2 go in-3 go out. The larger thread size is for the MC lines and the 3 smaller are wheel cyl. lines. There should be 2 out for the front, 1 for each side, and 1 single for the back, which will be the isolated one.

Do as amx suggested and find the 2 out for the front using air, this will be your front MC in and your 2 front outs. Blow it through either larger hole and check for air coming out 2 ports!!

Easy peezy!!! Good luck with your project, Geof