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Fluid volume
With the smaller diameter brake master cylinder your displacing a smaller amount of fluid for the same pedal travel ... so if you need say 100cc to fill the front calipers then you will need to push a 5/8 cylinder through a longer stroke than you would a 7/8 cylinder.
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Cruising in 5th
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Never be afraid to do something new, Remember, Amateurs built the Ark: Professionals built the Titanic.
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