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Not actually true - no one uses the same size pistons for their 4 pots as their 2 pots. If the 4 pots' \*total piston area\* is the same as that for the 2 pots, you'll generate the same travel. Some are sized for exactly the same amount of piston area, some slightly more to Improve power. See the google sheet posted above In the comments for total piston area by brake model.
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