I have a stupid question. How would I know if my brake fluid was boiling? At a recent debriefing meeting at a driving school, a guy was complaining that his brake fluid was boiling. Some of the other drivers said they use high temp fluid, etc. Educate me, please, because this is the first I ever heard of this. How could I check to see if I have this problem ... and could I use high temp fluid all the time, or just at driving events?