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MC should match total volume of brake calipers. If you upgrade to larger piston calipers (which i did by going brembos in front), your normaly firm brake pedal will become weak and pedal travel longer...upgrading to 929 MC with 1" solved this situation back then.
Now, upgrading rears from single to 4 piston is again enlarging piston area and volume of fluid, so going bigger MC might be again necessary. Of course, you wont loose your brakes by keeping stock MC, but feel will be different and its up to you if you how to solve it....
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