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Gunsmithing Brake in ss tumbler

It could. Pins might damage the thread crest. Not worth the risk. Your brake doesn't need to be like new clean. Leave it in carbon cleaner a week, then make a pick from a thin bronze rod. You'll get most, if not all the caked on carbon removed.
 
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I agree, when I tumbled my brass in SS pins it rolled the case mouths in and had to deburr them again.

Casey
Try Southern Shine Media in FaceBook. They sell stainless steel chips that work great. Being smaller they get into the primer pocket, easily pour out of the case, and don't peen the brass. I moved to them about two years ago.

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bore tech C4 carbon remover. put it on and let it soak, removes the carbon ring from barrels by leaving a wet patch inside for maybe 20-30 min. Maybe it will work on the brake.
 
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Just set it in boretech c4 for an hour and a screw driver with its wide blade easily scrapes carbon off in large swaths, a steel bristle brush does fine as well. A little pick for the inside and curves.
 
I've tumbled a really dirty brake that wasn't cleaning up with carbon remover overnight in stainless pins, soap, and water... Got it spotless and zero thread damage. We're not talking about soft brass here like a case mouth that can peen over from excessive tumbling, the brake threads are steel or stainless steel.

I wouldn't tumble a cerakoted brake, and probably wouldn't recommend it on a lightweight aluminum brake as it may peen the edges and threads. But I can say it did a great job on a bare stainless brake.
 
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