Reply to "Help Needed"

I think Daniel nailed it, it could be a bad shock. It doesn't even have to be a front shock, it could be a rear shock too. On the race car (not a Pantera), a bad shock will make the car twitch and turn and behave horribly under braking while it still seems ok cornering. I thought I had a major problem at the front of the car and it turned out to be my left rear shock.
And Julian is right too, you want that bias adjuster on the rear brakes. Most of your stopping power comes from the front brakes, so you want full pressure up front. You then use the bias adjuster to limit the rear brakes from locking up. Weight transfers forward under braking and the rear of the car can get "light" and lockup. It's also why a bad rear shock could cause your problem too. Weight transfers diagonally, so a bad left rear shock will load your right front tire more under heavy braking. So I would try swapping the shocks side to side and see what happens. If you want to get fancy, a race shop should have a "shock dyno" and could test your shocks for you.
And make sure your alignment is good and a rear tire isn't toed out. If a rear tire is toed out, your car will "crab" or "dog-track". You probably couldn't feel it driving on the highway, but under braking you would have to counter-steer against it and there's your "pulling" problem.
A good alignment shop can also check what I think they call "thrust angle". Which means the rear wheels are in line with the front wheels and not skewed.