I have been having a little parking break issue, and yesterday I diagnosis the problem.
It seems the entire break linkage has a little left to right play in it, and if slides to the left the little peg (circled on #9) connected to the parking break does not catch the arm that is on the rod connected to the foot break (Circled on #24). Should it have that much play? If I take my foot and kick\nudge the break pedal sideways towards the tractor then it catches fine.
P.S. I'm not sure I like the change to jdparts.com