Quote:
Originally Posted by 40 Deluxe
Actually, the size of the pistons doesn't matter, as the system is filled with fluid to begin with, and piston travel is very small. The need for a large reservoir is because disc brakes have no adjustment for wear. As the pads wear, the piston extends further out, but does not retract. So fluid level in the master cylinder goes down. With a small reservoir, the master may go empty before the pads are fully worn (if no one tops it off in the meantime).
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I think I know where you are trying to go with this, but what you are saying is not totally true. A large bore, will require more fluid to move a given distance. And hydraulic pressure is created by the ratio of the different bore sizes; MC to WC or caliper.
To me the most alarming thing happening today, is these drum drum vehicles are being used with MC with different size reservoirs and no residual pressure valves. Typically a large/small reservoir on a MC means it is disc/drum. When you see a large reservoir you can count out a residual valve and even the opening for fluid flow will probably be larger. You loose some engineered brake bias.