oh no a kid that thinks MNsubaru "is stupid" doesnt like me.....anyways definatly take it in...it could be bad, or it could be just the sensor inside the resevior.
the e brake is all the way down, it started coming on and off and then one day it just wouldnt go away..
hard braking will wear down your pads which makes a place for the fluid to go, thus making the resivior low. glad you found the problem.