ok, i was just out driving and my brake pedal started to feel funny, like i had too much brake fluid in the master cylinder. it was like this for probably 4 or 5 times of braking, and then i went to stop at a stoplight and the pedal went almost to the floor. i kept driving and the pedal would still go down further than usual, but by the time i got home it felt about normal again. i couldn't find any air or fluid leaks, so i am very confused. does anybody have any suggestions on what i should check? my brake fluid is in between max and min. thanks.