[pissin on hondas]

ok check this out...i flushed my system an all that...but this a question about my brakes....i jsut got new brake they're on..everything worked good for a week but now when i step on the peddal it hits the floor an i have to pump it to build pressure...it feels like theres aior in the line..but i replaced all the hoses an master cylinder an it stills hits the floor wit little stoppin power...i got all the right parts an made sure theres no air in the line ...its at the machanic now ...so anyone please let me know what u think it is