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Is one of the bolts held on with a nut, instead of going into the bracket? Maybe you are just spinning the nut but not actually relieving any tension?
My technique is to always go very slow and take breaks. Try to get penetrating oil in the threads overnight at least, then soak it again and start loosening it. Once you rotate it a bit, soak it again and let it cool for a couple minutes. I dont have much solid evidence, but I think most of the time if a bolt breaks after you have started loosening, its actually caused by overheating it and weakening the steel.
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