Alon brake bleeding. Pressure or vacuum bleed?

I did the whole Alpha STC set... new reservoir, master cylinder, and flexible lines. Bleeding wasn't terrible but I didn't succeed on the first try!

I pressure filled upwards, but still had air issues. Next, I did the old-school 2-person system that works on old, non-antilock cars.... Loosen the bleed screw and have someone in the cockpit push the pedal down and HOLD it. Close the bleed and then have them release the pedal. Repeat for a while, checking the reservoir from time to time.

I think the sudden, fast fluid movement that happens when the pedal is fully depressed against an open bleed is good for dislodging bubbles. After about a reservoir and a half worth of fluid... mine was perfect.

either method is correct, and brake bleeding is one of those things that it either goes easy or it fights you every inch of the way. I prefer pressure bleeding from the wheels up as it is easier to push bubbles up. If you have to, you can bleed from fitting to fitting, meaning cracking or disconnecting the brake lines at a fitting and bleeding to that point.

OK, Alon peculiarities maybe getting me.   Replaced flexible brake lines……. Dated 1995 and 1988!!!!!!

pressure bleeding from main wheel up right wheel then left.   Both side did manage to push fluid thru until it came out master cylinder.  Pedal still went to firewall.  Went back to right side to re-bleed.  Would not push fluid thru was hydraulic locked.  Removed master cylinder top and relieved hydro lock and bleed.  Replaced master cylinder top and pedal still goes to firewall.

Are we missing something in order of events for this single cylinder set up?  We bled them last year after replacing O-rings in master cylinder but only had to bleed enough to refill line at master cylinder.  Had same hydro lock issue then.  This was a full system drain so air trapped A bit somewhere?

I did find and read one post about this and there was one each recommendation pressure bleed and one recommendation vacuum bleed.

I am only starting down the road of A&P and my supervising A&P is scratching his head too.