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We don't have a preferred tool for spreading the pistons. The one thing you do want to make sure of however, is to 1) clean the sides of the pistons before pushing them back into the caliper. Debris on the sides of the pistons can cut your internal piston seals. 2) cover the pistons with a rag before pushing them in. You don't want anything hard directly contacting the pistons. If you nick the pistons, create a burr, etc., it can also damage the internal seals when you push the piston back into the caliper.
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