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A larger bore in the master cylinder does NOT make your brakes work better, but the other way around. A larger bore means that the pressure (pressure = force / area) decreases, you have to press harder on the pedal than before. A larger dia on the brake cylinders however means that with the same pressure as before you have a higher braking force (force = pressure x area). A larger master cylinder bore should normally be done in conjunction with a larger booster, or a tandem booster. If your new master cylinder is 13/16 instead of 3/4, your necessary brake pedal force will increase by around 17%.
Dieter
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