Welcome to AFM! Let me move this to the Classic Tech section for you and we'll get you figured out. Thanks for joining...
+1 on this. If you verify all is good here, that only leaves the MC as you were thinking before.I'm in agreement with other posters on this thread; if it was working fine, and now just goes all the way to the floor, it sounds like the push-rod has come out of the back of the master cylinder! Crawl under the dash and see if you can tell if the rod is on the brake pedal still.
aiways a good way to remember,B B,big shoe in backare your brake shoes on correctly, the front and rear (for each individual wheel) are different, there is a long shoe and a short shoe. short shoe goes toward the rear if i remember correctly.
Ive been there, as well as most of us I suspect, and one rig I never got a solid feel to it. One thing to consider is that the system is highly sensitive to air in the lines, and patience will help. In you case its hard to say for sure what is causing the problem, and I suspect its still an air thing. On one rig I was having my daughter help bleed brakes, and she was inadvertently letting off the brake peddle ever so slightly and it took me forever to figure that out.Would gravity bleeding get all of the air out of the lines? And I'm not sure if i am properly bleeding the MC but I've done it many different ways and looked online as to how its done. I'm literally pulling what's left of my hair out thinking about it. but ill go over it and do another check to see what i might have missed. Thanks again for the help, ill take as much help as i can possibly get.