I did not replace the steel lines. They looked to be in pretty good shape. I did replace all the rubber hoses, fittings, and washers. Everything is tight with no leaks. I didn't suspect the master cylinder because I just put a new one on last year. I've got another one ordered. We'll see if that fixes it. Thanks everyone. I'll update once I get the new master cylinder put in and everything buttoned back up.
Naturally, when I disconnect the brake line from the master cylinder, brake fluid will run out from the master cylinder and from the steel line. When I install the new master cylinder and reconnect the steel brake line and refill with brake fluid, I'm assuming there will be air at the beginning of the system. Is there special procedure for bleeding in that circumstance to get that air from the front of the system or do I just need to bleed the brakes again like normal at all four wheels?
