clutch hissing

i have a spec 3+ w/ spec aluminum flywheel on for about 3-4 thousand miles/ 1 year. it isn't a DD and last week when i drove it i heard what sounds like air hissing when the car is in 1st and i am letting the clutch out. it's very very obvious when i let it out slowly and hold the brake so it won't move. it isn't leaking hydrolic fluid. it does sound exactly like air hissing. the clutch still acts normal and shifts the same as it did before the sound started