Just a FYI. In case anyone doesn't know about it. If making your own lines, forget steel or copper. Use the copper/nickel lines. So much easier to work with, will never rust, and will hold the required pressure (even for brakes). Just an example
1/4" (.25" O.D.) Copper Nickel brake line - Tubing Roll - Flat coil - 50 Ft. | eBay comes in different sizes, and lengths