Hmmmmm.
Not sure on the actual effective piston dia
At the pad facevit measures 1.575" dia past the rubber boot, but piston may be stepped down outside the bore to accommodate the boot?.
Does the 70 % rule apply irrespective of disc dia?. Ie with 13" fronts, and say 11" or 12" rears, obviously the leverage where the pad is acting is different.
Apologies for what may seem like simple questions, brakes are pretty new to me (boats don't have them lol)
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Working on going faster (and now staying dry at the same time !!)
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