I discovered my brake line from the master cylinder has been flattened by the previous owner probably put a bar on it for some reason and pried on it.  The brakes still work but I want to replace the line for obvious safety concerns. I have options of replacing the front line only or all of them. And if I do is there any advantage to putting larger lines like 3/8” on instead of the 5/16” it has now?  I’ve thought about a dual master cylinder and update everything. I’m pretty much ready to start driving it in the next few weeks and now I’m contemplating what I should do,any suggestions?