Hi there heavy equipment family. I have a JD 644j that has been an awesome machine however it just developed an issue this week. So I use this loader to load millings maybe 5-10 loads a day so we use it and then it sits until next load. Maybe 2 hours use a day. Well the other day we had a big job and used it for 8 hours. Towards the end of the day the parking brake applied itself while operating machine, about ended up through windshield. It will turn back off and work for a while and then do it again. Thought maybe it was from being hot, but finished that day and the next morning I went down to try it out. 5 min in and it did it again. I have done some searching but don’t want to just throw parts at it if possible. Thanks