My 1992 Disco has been off the road for 5+ years. Before getting it back on the road, I have overhauled the brakes, stripped down and cleaned the calipers, fitted new pistons, new seals and new bleed screws. I have renewed brake master cylinder.

I have bled the brakes, no air comes out and there are no hydraulic fluid leaks. But, my foot still goes to the floor when I try the brakes. I can get a 'solid' brake after 4 or 5 pedal strokes. I can feel the front brakes working when the pedal is depressed (car jacked up and rotating wheel by hand) but there is no rear brake action, the rear brakes are on the primary circuit with one of the front caliper cylinders (the secondary works only on the other front caliper cylinder).

Could it be the brake regulating valve? Fluid gets through to the rear calipers. Any ideas?

are the brake pipes in the correct fitting holes, slob and i had an issue with this a while ago, if the pedal is going down and then pumping to solid there is still air in the system asomewhere, it could be the regulator as you say but the best thing to do is bleed them with an eezi-bleed its the only surefire way of getting all the air out

I checked the pipe connections. I think they are correct (that is, the primary circuit connections on both front calipers go to the same holes on each side, but I could have the primary and secondary circuit connections swopped but it would be the same on both sides (Haynes and the LR Workshop Manual are both vague about the connections). This time I tried the brake bleeding procedure as in the LR Workshop Manual which is different from the Haynes but I still get the pumping effect on the rear wheels which, as you say, would mean air in the system, but where? There are no fluid leaks that I can see and I am sure I have bled all the air out (I have done this before and never had this problem!).

make sure the servo is working ok. fluid can collect in there.