Looking for a firm brake pedal

You need to decide if this is "pedal movement" before a firm pedal or just lack of a firm pedal

Cylinder............master..........sizes

Think of it as a lever, a crowbar. If you stick a crowbar of a given length (your brake pedal) under a rock at one end (the brake shoes) and put a fulcrum under the bar to pry against, the length of the bar between the fulcrum and the load getting longer will make the load harder to move. Likewise, making the bar on your side of the fulcrum longer makes the load EASIER to move but you have to move the bar FURTHER at your end to get much movement at the FAR end

Same thing with cylinders and master

As you make the cylinder bores larger, or the master smaller, the pedal must move further, but will require less foot pressure to provide a given stopping force.

Likewise, making the cylinder bores smaller, or the master larger, the pedal will not depress as far, but will require more foot effort