Originally Posted by Rusty

Brake fluid is hygroscopic. It will suck moisture out of the air. An open sealed bottle is good for no more then 6 months. Unopened bottles. I wouldn't trust over a year.

EW, bleed your brakes a couple of times. Then after a month. Get the brakes real hot, like when you are bedding the pads in. After you do that. Bleed them again. This should take care of any remaining moisture in the system.