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The design of the brakes on the Pace, PMP and XXX 600s requires a lever style master cylinder (without the pedal system for the XXX). The chassis come with a 3/4" bore master cylinder. We found a 7/8" Bore master cylinder that allows more volume of fluid to hit the calipers at one time giving tons more braking power! Cast design for cooling. A must have when running a front brake on your 600. Also necessary when running a titanium rotor.