Originally Posted by
Martin
Yeah, bigger MC bore for larger caliper piston size
I thought all the sport VAG's had the larger MC
The Audi S3, VW R32 and GTI
(not 100% sure about the GTI)
But the Caliper piston on the front is the same diameter / same caliper for both the 288mm & 312mm front rotors.
The rear caliper is about 41mm for the earlier Lucas or Bosch calipers and 38mm for the later calipers.
Given all that, the only reason you'd fit a bigger MC to the RS is to give a shorter pedal.
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