Air in the air?
If your brakes feel "mushy" or you can pull the lever all the way to the bar then you need to bleed them. You should probably bleed them on a regular bases(every couple weeks depending on how often you ride). Also, change the brake fluid about once a year (or more if you want maximum performance).
yeah sorry about that, air in the brakes, but for the back brake its fine just as long as its not going through its entire travel with me pushing down on it, correct?