Since we are talking about brake fluid, I've got a question as well. Being a total noobie to brake technology, I was wondering if your brakes will go away if you overheat the the entire system. I had some small netting that is used in landscaping get wrapped up in my front brake system a few weeks ago. I didn't notice it at first, and rode maybe 2 minutes like that. Front brake lever went straight to the bars. I stopped, checked out the caliper, all the netting was wrapped up there, and it was pretty freak'n warm. So I pulled it all out... couldn't find any leaks. Pumped the lever up, and its been working completley normal ever since. Could the excesive heat have caused my brakes to go out like that???