Know it’s been gone over but looking for new advice. Just replaced all calipers, rotors, pads and MC which was bench bled. Can’t get brake fluid to rear brakes. Don’t think the 69 has proportion valve but just a switch. Tried every bleeding method even the old fashioned two person method, nothing. What am I missing?

 

Try gravity bleed. Open up each valve and let it drain until fluid starts coming out. It takes time but keep an eye on the master cylinder level. Don't let it run dry.

 

You're missing a systematic step through a diagnostic method. If you understand the hydraulic operation, rather than "try everything" as you think you have, step through the expected flow of fluid through the system.

 

Gravity won’t work, tried.
Systemic, just working through the system step by step but nothing seems to work. Thought maybe be something I’m missing like the proportion valve

 

Did you replace the flexible lines going to the calipers?

 

Those rubber lines grow closed in time, not allowing fluid to pass. Change um

 

If your brake-failure warning switch is activated such that the piston is blocking the rear port then it won't allow fluid to the rear circuit. There are simple tools to re-center it, some have used small screwdrivers or other similar small tools. Access to the piston is done by removing the electrical fitting. It's also said that you can "stomp" on the brake pedal a few times to recenter it.

 

Another vote for the rubber hoses.
Assume the Brake light is off?