Originally Posted By RapidRobert
next time it does it, pull over & crack the bleeder (open it then shut it) & see if that releases it. EDIT do it if possible on a deserted stretch of road & go aways WO hitting the brake & see if it cools off/or stays free.

another option on this same approach is to crack the banjo bolt. this is "if" your bleeder screw is really rusty, and the banjo bolt is easier to get to with the front wheel cranked the whole way to which ever direction offers the best access to the bolt.
beer