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PeterC said:But don't split the calipers until the pistons are out! Use the car's hydraulics to push the outer piston out while keeping the inner piston from moving with shims or the like. Do this for both calipers. Then take them off the car. Now you can use a punch on the inner piston because the hose port is conveniently located in the center of the piston. Then take the caliper apart.
or, do like I did - split them and then use some air to push out the pistons - slowly into a rag