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The first time I went to ride this season (one day back in early March), I noticed that when I first pulled the front brake lever, it felt like there was nothing there...... The lever went almost to the hand grip....
I pumped the lever a few times and then the brakes came back to a somewhat normal feel.
I checked for obvious stuff like any signs of leaks around the front brake calipers, hoses, etc. No signs.
When I did check the brake reservoir, the level it was indicating did seem to be at the low mark, whereas when I last put the bike into storage, it was at the high mark.
I took the reservoir cap off and saw that the internal rubber plug or what not seemed like it deformed a little: that is, it looked like it bulged upwards toward the top of the reservoir. I carefully took the bulge out and the fluid level seeming returned to normal indicated level. I decided not to add any more fluid.
Since then, I have ridden twice and everything seems fine.
Does anyone know what happened to my front brakes during that storage period? Was it possibly cold weather related?
Bike has 15k miles on it, original brakes, calipers, etc. if that helps.