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I'd really like to see the manufacturers publish their piston diameters, and reviewers to include this information as well. There are pros and cons to 4 piston vs 2 piston, and the difference in clamping isn't always as much as you'd think. Given that they typically use the same master cylinder, any difference in total piston area should have an impact at the lever as well (have to push more volume if the piston area is larger). I'd love to see a back-to-back comparison of 2 piston vs 4 piston models.
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