It's the other way around; the smaller bore gives you more brake affect with the same pedal pressure. The downside is you run out of pedal if you need more fluid movement than the smaller bore can deliver. It's like using a hand pump with a big cylinder versus one half it's size. Like a 125psi tire on a racing bicycle, you can't push hard enough to move a big piston, they're 1/2" diameter in bike pumps.
I've had a BMW 900 for over 30 years. It has twin disks up front and a 17mm master bore. The factory changed to a 15mm a couple of years after my bike was made. That was done after enough complaints of needing a superman grip to slow the dam thing. Today they would have a 12 or 13mm in there, as peeps like a 2 finger brake that can lock the front wheel.LOL
I've got the 4 piston discs on my '70 Camper Special F-250. Everything stock and it'll work up and down in the Sierras with a 10 foot camper in the bed and a trailer with 4 Huskys in it being towed.
You really need a good booster with discs because you don't have the self-energizing deal like when drum shoes are trying to jam themselves against the drums...it's all just how hard the booster will boost.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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