Have you got a Bentley's? There's a quick 'n dirty procedure in there for testing the master cylinder, brake bomb, and associated componentry. Don't quote me on this, but I think it goes something like:

- Pump brake pedal ~ 6 times with engine off and hold it, start the engine and the pedal should drop down for a second and stay firm at that point.

- At idle, push the brake pedal down until it stops. It should stay firm (test the plumbing, obviously).

I'm betting that there's air in there and might have to be pressure bled. It sounds like your procedure is correct, the only thing I do differently is I open the valve, have the helper jam the pedal until new fluid comes out, and then I close it up MID STROKE so that no air goes back into the caliper in the vacuum.

Don't give up yet

Also, my pass side front rotor seems to do a little of the same thing. I replaced the caliper as well, but it's not sticking or causing the car to pull. Braking seems very even, or - at least, as even as it can get with the shitty pads I have on there right now.

best, whit