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Will the front brake calipers from a 2012 -14 jeep srt-8 fit on my 2009 srt-8 challenger
 

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I've been wondering the same thing... They obviously "Can" fit, because the spy photos of the HellCat shows it with the 6 piston front calipers. But what is required to fit, if anything, I don't know!
 

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Having two more pistons wouldn't it require more as far as the mastr cylinder and actual volume of fluid being moved.

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If the six pistons were the same size (bore/stroke) as the four pistons, then yes. But typically the pistons
are smaller so they may actually equal out to the same displacement.
 

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Bolt pattern for the 12-14 Grand Cherokee front Brembo is 140mm vs. 130mm for the old Brembo, 10mm or 3/8" of a difference. The piston dia. of the new GC Brembo is approx. 39mm. I assume the stroke to be same as the 2 pistons because of the design envelope parameters. Area of a circle is π x R². Total area of the 3 piston faces added together is 3582mm (approx.). If someone has a 2 piston on hand, they can do the math and post to compare.
 
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