So I have a 2010 corolla s with extremely spongey brakes. I press almost all the way to the floor before I actually get any braking power. So I decided to bleed the lines and I did it properly with a helper, made sure there was fluid in the reservoir, started from the farthest point away and after all of the lines were bled they feel the same. I figured as much because not much air was coming out of the lines. So my question is, is this is a master cylinder problem? Do I need to remove the cylinder and bleed that? Or is this something else?