OK----one other thing-I have always said about brake issues-but it was generally about braking from speed but I do see how it could be possible in this case-------when you have a braking problem-look for the cure at the other end of the car-----Maybe the choice of either the front and or rear calipers is the wrong size ratio of area/volume. It could be that the fronts are too small and your master cylinder is being stopped at that point before the rears do proper contact-OR, the rears are too big and you don't have enough volume for them?? or both??? Since they went to the dual brake anti fail system back in 1967?(I think) the volumes and pressure are strickly regulated to get a certain reaction from your brakes for if one end of your vehicle fails, the other end will stop you BUT there will be severe symthons from pedal pressure and travel.

As this gets more and more complex I would resort to a very basic method of chasing down where the faults lie-I would procure a simple master for a single brake port (maybe clutch master?) and with a pressure guage to verify pressure would then check ONE caliper at a time to prove each separate part/ component and then go deeper as I put the complete system together.I'd remove all the valves, combo, residual, delay, porportional, etc and only work with pedal, manual master,etc, etc


If you don't have it worked out by the time that plane is ready to fly , I'll come down ??????????????Selma Texas?? I remember Selma, Ala 1965