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I suggest new rear wheel cylinders while your at it along with hardware and the master cylinder is probably due to be changed also especially if the oil is real black in the reservor. Blast the lines with high pressure air good run a little oil thru and blast them again until the oil comes out clean then hook them up to the calipers and cylinders. I just depends how far you want to go.I would bleed the brakes and change them all the way around, including the rotors and drums and inspect the lines.
I suggest new rear wheel cylinders while your at it along with hardware and the master cylinder is probably due to be changed also especially if the oil is real black in the reservor. Blast the lines with high pressure air good run a little oil thru and blast them again until the oil comes out clean then hook them up to the calipers and cylinders. I just depends how far you want to go.