Cant get all the air out of my front brakes

[adddy]

i guess a motor cycle shop can pressure gauge test the master cylinder hydraulically..
I have fitted a new hose (which i didn't blow out with an air line ) & new seal kits MC & calliper. i will retry popping in the pistons submerged, but this time with the bleed valve off then still submerged fit it back atached to a clear pipe & syringe to slowely back fill fresh dot 4... i may even assemble the lower banjo submerged ... fingers x for a Graham Jarvis endo system & a celebration beer