77 Pickup brakes

After replacing the entire brake (saddles, discs, blocks, brake fluid) and ventilating, the bag still pulls to the left. Even worse than before. So brake hoses (uralt) cut off and “bleed”. On the right came practically nothing. A pair of droplets then a little “threat” – then nothing more. On the left came also less than I expected. What would you say – replace hoses? (are already ordered…) or could it lie on the brake force distribution valve? I didn’t want to do this one-fac h so order on suspicion, because relatively expensive (GM replacement about 177 tacken). If it was “only” the hoses, the problem would be quickly and cheaply fixed. But if not, what could it be then? Someone’s idea? PS: I don’t want to think about the main brake cylinder. 600 euros the part…….with good luck used for 300 – unchecked of course.