Help Needed. Can't Bleed Brakes

[jmillsUT28]

Having a heck of a time with this my 72 blazer that I bought. The guy I bought it from had it as a project since 1995. So did not drive it much at all.

Please tell me what I am doing wrong.

Problem: can not bleed front or rear brakes.

What I have done. Replaced master cylinder, front calipers and combination valve. I've bleed the mast. Pushed the needle in on the combination valve while trying to bleed the front brakes but can not get any fluid at all at the bleed valve on the caliper.

What am I doing wrong? I have not tried the rears as I have found they are missing a few spring that hook up to the brake shoes.

Can't believe I am having this much problems out of brakes!