If you changed the bomb thinking that this was the problem what you have to check is the hydro. Throughout the center he carries a thrust rod that is the one that makes pressure on the pump and that rod is adjustable and it may not be doing the indian pressure disarms the pump and measuring (if it is in good condition, otherwise you change it).
In the event that all this is good and there is no escape, it means that there is air in the pipes and you have to purge, now something else, the way of purge also has to be the one, purges to pressure with the brake pedal pumping without any pothogue so that you see if the air of the pipes comes out.
Luck.