Staffy
It's not yours 'til you cut it up.
I had a situation a while ago where I bought a new master cylinder and it turned out it was too small in diameter. The result of this was a brake lever that came all the way to the bars and hardly pulled up the bike at all.
You have a set volume inside the system and because the fluid doesn't compress, all fluid displacement results in equal displacement at the other end of the line. Therefore it can be assumed that a brake cylinder when working in unison with another brake cylinder within the same system whilst under pressure from a master would have half the volume of fluid causing displacement than if the other brake cylinder was removed. This means that your single brake cylinder has to move twice the distance for the same amount of lever travel (if you take one brake cylinder out), due to it needing to displace the same amount of fluid which is initially intended for two brake cylinders.
Hopefully that's not too long winded and makes a bit of sense.
You have a set volume inside the system and because the fluid doesn't compress, all fluid displacement results in equal displacement at the other end of the line. Therefore it can be assumed that a brake cylinder when working in unison with another brake cylinder within the same system whilst under pressure from a master would have half the volume of fluid causing displacement than if the other brake cylinder was removed. This means that your single brake cylinder has to move twice the distance for the same amount of lever travel (if you take one brake cylinder out), due to it needing to displace the same amount of fluid which is initially intended for two brake cylinders.
Hopefully that's not too long winded and makes a bit of sense.