i haven't post a question for a while but i haven't been working on the old truck ,either! i rebuilt all the wheel cylinders and the master recently . the truck sat for years and some cylinders were pretty stuck when i dissasembled them . i now have a rear wheel cylinder that doesn't always retracted after stepping on the brakes, making that drum lock up . the lines were flushed out a little and i was thinking maybe i should flush even more . how long should i bleed the system? could ther be something wrong with my master cylinder and how could i check . anybody ever come across this problem?