Every couple months i have to bleed my brakes because of air in the line what canit be that causes that?

What is your question?

If you pump the brakes they feel good like they should when you step on them . If you dont its like they just go to the floor , they still stop you but bfake peddle does t feel right and every couple month i have to bleed air out of the li e

What makes this problem better or worse?

Bleeding the brake line makes it better but only tempory . Pumping the brakes is an immediate bettwr but only til the next time yiu need tl stop

How long has your 1996 Subaru Legacy had this problem?

About a year