Power Disc Brakes not working on hard stop?

OK - latest update. I have a vacuum pump made for power brakes on engines with low vacuum and hooked it up to my power brake booster - like car is running right - it maintains the 18-20 inch pounds required for booster. Booster holds 21lbs of vacuum overnight. So booster is good from that aspect. With the booster under vacuum I bled the front brakes old school - pump and hold. I did this to check pedal travel. Pedal drops perhaps 1 inch when I bled the caliper - same reaction both sides. I don't get a lot of fluid but was able to flush out the front system with new fluid. I went to the back as long as I had a willing partner to push the pedal - ugh back brake line clogged no back brakes - will swap that line out and let folks know results.