Might look at my thread here.
https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=3589&forum=1&post_id=37579#forumpost37579 In my case, the tow truck driver took the brakes apart, but I don't think you have to do that. I assume the 39 Junior will have one bearing like mine.
Remove the bolts in the center ....4 or 5 I don't remember. You will need to back them up to unbolt. There are gaskets to replace and maybe some shims. KEEP TRACK OF WHERE THEY GO. Take the bearing plate off and you will see the bearing.
The axle will slide out with minor persuasion. Press off the bearing with a press, clean and repack and go back on as it went off. You can get gaskets from the usual suspects but they are easy to cut.
If you don't have access to a press, I suppose you could simply clean it and repack it with it still on the axle if the bearing feels ok.
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