Just got through changing out the pads on my Wife's TBA.
Holy hard time batman!
I have bled more then one brake system in the past but I have never had the problems I had with this one.
Back brake bled pretty easy. I had the caliper completely off at one point so the system was dry. I was able to just bleed in the regular fashion and it worked slick.
The front was a different story. I had that caliper off also and put new seals in it. I could get no pressure at all trying to pump fluid through it in the conventional fashion, even with the caliper off the disc and hanging straight down. I borrowed a vacuum pump and tried that method and was able to get a little pressure but not what it should be.
I then let it sit over night with the brake lever depressed and there was no improvement.
I then just for the heck of it, pumped up what pressure I could get and cracked the banjo bolt at the reservoir.
Voila! Apparently that fitting is an air bubble trap.
Got good brakes now!