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A 2-piston sliding caliper generates the same brake torque as a 4-piston opposed caliper given the same bore sizes and effective rotor diameter. The 4-pot has smaller pistons than the 2-pot which less force. Not coincidentally, the 4-pot generates the exact same brake torque as the 276mm 2-pots found on the 2.5RS and older WRXes. It's about 8% less than the stock 294mm 2-pots.
Plus if there was more brake force wouldn't that make the bias worse?
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