Get a rebuild kit. The kits for about a quarter of what a new caliper would cost and will work just fine for what you need.
Use air and pop out the piston, look at it. Make sure all surfaces are smooth and clean. You should not need a new piston, brakes rarely do. The rebuild kit will be some new gaskets new rubber for the slide pins, etc. Its very easy, lemme know if you need help.
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The extra strength felt weak...
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