[L78_Nova]

I've had difficulty with those combo valve set ups. Often easy to get "driveable" but difficult to get proper "hard stop" performance.
I will generally loosen each line connection starting at the master and work back to burp a little fluid. Seems a gulp of air can be trapped and just surge back and forth in the line and make for some strange rear brake performance. It's a two man job for certain and go eeeeasy on the pedal or you will wear the fluid. Oh ya... lots of rags.