I've been working on a 1948 New Yorker as my first restoration project (admittedly with no prior experience) and I'm stuck on the brake system. I replaced all of the hard lines, hoses, master cylinder, and all wheel cylinders, but I'm having difficulty getting good pedal. If I pump it, I can get some pressure. That suggests to me that I have air in the lines, but I've spent hours bleeding the system. I don't see any leaks at the connections, in the lines/hoses, or at the wheel cylinders. Could I have a bad master cylinder even though it's brand new?
I'd really appreciate any thoughts from any of you who undoubtedly have more experience than I.