My front brake on my 09 450X has been feeling a bit spongy lately and I have bled it out twice with no air bubbles found. Now when I let it sit over night, I have to pump it a couple times to get pressure and then it is fine but still spongy. I have no fluid loss at all and am wondering if I have a master cylinder problem or something. The bike was new in December. Any ideas or other things to check??