Just bought a 05 236B. Can be driving it and park brake will activate by itself. Hit the release switch and can use it again for another couple minutes. Could it be a bad safety switch or the often mentioned ecm? I am an aouto mechanic but dont know much about these. Seems like an awsome machine. Quite an upgrade from my Bobcat 610. Dont suppose any one has a used repair manual for this machine that I could buy.