John, Well done, it should not be too long now.
I have always found that TR7 brakes require a 30 to 50 Km run, prior
to the last bleeding, to get them realy solid.
This is the case, even with our 8, which has only the distribution
valve, & the chassis mounted piping from the original Triumph
system, still on the car. So, my guess is, that its hard to get that
last bit of air past that valve.
Hasbeen