How do I relieve the brake pressure enough to replace the drums? on 2007 Honda Civic

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Replace rear brake shoes, but can't get the drums to fit over the new shoes. The pressure in the pistons keeps pushing the shoes outward.
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The return springs should overcome the brake pressure. Perhaps the return spring are week or the parking brake is to tight.
Finally got it and the brakes work great. I suspect the after-market shoes may have been the issue. THANKS for the reply.