On the 5x10 and 5X20, I know there is no parking brake only the park on gear shift level. I have read a few people breaking the park pawl, when stopped on a good sloop after taking their foot off the parks the tractor moves back a little and breaks the pawl. With the tractor OFF I have heard what some people do is put it in gear range A and in first gear saying that the tractor will slide if it does move. If you have MFWD and you think you broke the park pawl be careful, there is not much room in the transmission and you can mess up the MFWD.