Over the past few days at school I have been realizing that my brake pedal has been becoming verry soft at times. What I mean by this is that it doesn't feel like there is a good enough amount of pressure in the system or something because when I push down on the pedal there's nothing at all untill I reach the bottom and then it feels like my rear callipers are only activating. This was only happening about once a day in the morning when I start my car up. Then it would be fine all day after I had a class or two. But recently this is how my beakes have been period. They haven't inproved at all no matter how warm the car getts. I need help guys! I'm a college kid and don't have $ lol someone help me fix my car. Thanks guys,
Alex

 

Have you tried bleeding the system and checking for leaks?