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MotoGP God
Bikes: 748S, HM1100S, V4SP, Was: DD-A #111
Posts: 13,088
Join Date: Feb 2002
Location: Back in Essex
Mood: Passion Killer
Yep, deffo the master cylinder as it's only designed for one caliper!
I've got a 916 master cylinder with remote resevoir here that is yours for £50 if you want it - I used it last year on my twin disk system.