I just bought a Vulcan that’s been sitting for a decade and the previous owner said the brakes locked up but he got them free before I got there. I flushed out the disgusting dark brown fluid and got it running out nice and clean with no air in the system. They were working great until I pulled into a parking lot to inspect a fuel problem. Started heading out to the road and suddenly it didn’t want to move, front brakes totally locked. I cracked one of the bleeders and it freed up and got home using mostly the rear brakes. I noticed that the front brakes are working way better than before with absolutely no drag since cracking the bleeder. Any ideas why they suddenly locked up/started working again even better than before they got stuck?