ok, whenever i bleed my rear brakes and get them working, they are fine,and they work, however once i go out on my bike after about 20-30 mins, they sieze up, and they only way to get ride of this is to completely remove the pressure. this continually happens everytime i bleed my brakes, any ideas on whats going on, as i get to a point where i just dont use my back brake.
cheers.