If it's built on the D-15/I-600 chassis which I think it is then remove the wheels, fenders, running board or in your case possible platform that may be bolted to the drop housing. Drain the oil from the rear end and after blocking the rear end up and remove the pin from the brake linkage, remove the 4 main bolts that hold the drop housing and slide the housing out of the way exsposing the brakes. You will likely find worn out linings on the shoes and or oil from the rear end from leaking seals.
The fix is to replace the seals in the rea carrier while your into it this far as 50 year old seals are barely hanging on if they aren't leaking now. Remove the brake shoes and the 4 bolts that hold the rear carrier in the rear housing and one side at a time remove housing as the oil seals are removed and installed from the inside. Also replace the o-ring seal on the housing, clean and reinstall. This will keep oil from contaminating the new brakes. If it's just oil contamination to start with, clean up the shoes and scuff the brake drums and put it all back together. If you need linings you can get just the lining kits or opt for replacement shoes but they are much more costly. I have new lining kits that I did not need for my D-15 that I would part with at cost. This cleaning and service of the brakes should return both sides to near new performance as these brakes are very simple and work very well.
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