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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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