rear brake caliper

[Bill Magitz]

This is a question regarding the 1984 Sabre my brother gave me. He said the rear brakes were sticking , but when I removed the caliper I found the pistons to be frozen in place with corrosion on the exposed sections. Now I am not even a good shade tree mechanic so i am not sure what my best option here is. Do I try to free it and clean it up or do I just replace the unit ?  If I try to free it what would be a good method , I have an ultra sonic cleaner at work I can use if that helps. thanks for any advice---bill m----

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