Nonlinear Brakes

So I have changed out rear drum brake pistons, rebuilt front calipers, new flexible hoses, new stainless steel lines I ran her for a little while on that setup, and then purchased a new master cylinder and brake booster. Now I have 0 braking effort for 90% of the travel and then the brake kicks in a the last second and locks up.

I have bled my brakes twice with no noticeable effort. I think I have one of two problems:

1) Push rod adustment: I don't feel like the brake pedal is loose and that the pushrod is making contact further down the travel. It wouldn't explain the brakes locking up. Are these guys compatable with brake boosters?
http://chucker54.stores.yahoo.net/brakcylpuspa.html

2) Do I need to bench bleed the master cylinder?

Did you properly adjust the rear shoes?

No, but they were working before I swapped out the master and the booster. I then drove 1,000 miles. If they were off, would they not have adjusted by then? This problem showed up after the master cylinder and booster swap.

Are you saying you did not bench bleed the master before you installed it?

That is correct. I have a pair of old brake lines that I can use to do the job. I think after my reading that this is probably the problem.

Why would the brakes lock up so quickly?

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So I have changed out rear drum brake pistons,

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That statement tells me you fooled with the rear brakes. Mind you the rear brakes will only self adjust if, A. the self adjusters are properly assembled and working and B. they only self adjust when you stop while going backwards.

How many of those 1000 miles were your stopping while going backwards? The self adjusters are really only there to compensate for wear, not to correct maladjustment, though it will eventually do so.

And yes, you should always bench bleed your M/C, make sure you have a cover on it and do not stomp the pedal or you will squirt brake fluid all over the place.