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I'm trying to replace my brake pads but when I try to push one piston in, the other one will come out and when I push it back in the previous one will do the same... how do I fix this so that both pistons remain retracted?

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You need to push both pistons at the same time. There are tools for doing this, but many of us use a large flat bladed screwdriver.

You need a steady firm pressure for a few seconds to force the fuild in the lever back into the reservoir. Have a look at this Park Tool video - about 4:10

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