This is a tough one.
The brakes were fair, but pedal travel too long, and not to my liking so I decided to change some components. Afterwards, I have not been able to build any pressure at all.
What I've done:
1. Changed master cylinder three times with different types, each time bench bled.
2. Replaced Booster with new.
3. Removed the shuttle valve from distribution block.
4. Removed the proportioning valve, installed T.
5. New bleeder screws, and yes Teflon taped.
6. Checked push rod multiple times. I adjust until there is pressure felt when bolting up the master, and then I back the rod off a couple of turns.
7. Inspected pedal to booster connection. Pedal is adjusted to proper height.
8. I've blocked off the calipers with a bolt to the brake lines to make sure it's not the calipers, and yes, they are on the right sides.
9. The brake lines are braided, NEW.
10. Inspected for leaks a lot.
For bleeding, I've used Speed bleeders, suction, and reverse pressure devices. Sometimes it appears there is no air, but other times there appears to be a little.
All of this and the pedal goes straight to the floor with only the booster acting as resistance.
What am I missing?