Series 3 brake Problems

Hi all im new to the 4x4 scene and have acquired a series 3 SWB cheap of a friend.
Have started doing the required restoration work which has included a full break overhaul.The drums were ok so i have replace all wheel cylinders and shoes, new seal kit in the master cylinder as the cylinder bore looked and felt ok,and new hoses. The brakes have bled fine to each corner expelling all air. However when the pedal is pushed for the first time it goes to the floor but then gets better the more its pushed, until you leave it for a few second then its the same again. All shoes ar adjusted correctly, there are no leaks and all shoe springs are fitted correct and are fine it is also the same when the engine is running any help would be much appreciated

cheers dom

shoes have to adjusted quite close to drum else pedal movement to large if no air in system,

check that you have the springs in the right holes on ALL wheels.

also as above check on all wheels the ajusters.

You still have air in there somewhere. Try clamping each hose one at a time and try the pedal, you will then find out where the air is.