73-76 CJ5 Brakes Won't bleed
Good evening ladies and gents. Here's my issue. I rebuilt my CJ5 and the last thing to do before taking it out is the brakes. Here's what I've done so far:
1: Tried bleeding them the conventional way (RR, RL, FR, FL)
2: Tried bleeding the front first (FR, FL, RR, RL)
3: Cleaned the proportioning valve
When trying method 1, I didn't have any fluid come out of the rear brakes.
When trying methos 2, I started seeing fluid come out then it disappeared and didn't return.
During method 3, I used air after cleaning the prop valve and each port worked as it should.
Also, when I press the brake pedal, there's about a 1-2 inch gap (play) before it's easy to tell that the master cylinder piston is actuating. It seems like a lot of play to me but I'm niether an expert nor a seasoned vet when it comes to this. I'm just a Nugget so I'm looking for whatever guidance is presented to me.
Having presented my findings, it seems to me the Master Cylinder is bad, however due to cost, I'd like to get the opinion of some pros before I make the decision to replace it.
If it's not and someone has another method of bleeding please let me know.