New breaks are going out

I recently replaced my wheel bearings and decided
on getting a the kit, however my breaks are no
longer holding pressure, and occasionally will
squeal followed by a loud pop and loss in break
pressure.  I looked over everything and even
checked for air in the system, nothing. I checked
the break lines and they were fine, no leaks that I
could see or feel. I still have some breaking power,
however I have to put it to the floor to get it. When I
got the kit, I double and tripled checked that it was
for my car, brand, year, and even size. What I
suspect is happening is that my break pads are
getting lodged against the rotor until it pops and
suddenly theres no pressure.