Today I want to give you some information about Master Cylinder sizes and the best way to understand what to use.
To start with you need to decide what is the best bore size to use, it is not as simple as just using any cylinder that will fit. There is the requirement of mechanical advantage to be considered.
The smaller the bore diameter with the correct pedal ratio will give greater line pressure for a given effort on the brake pedal. Its this generated line pressure that pushes the disc pads against the discs/rotors.
The problem is that a certain volume of brake fluid must be moved before the brakes are on, and the more worn the parts the more movement is required. This is why regular checks and new parts are recommended.
If the master cylinder capacity is not large enough, such as when the bore diameter is too small, the pedal has to be moved too much before braking action starts. If this happens then you may not get enough travel left before the master cylinder runs out of travel. If this happens then you will require to use a slightly larger internal bore sized master cylinder.
The higher the pedal ratio the greater the pedal movement required before braking action starts. If the components are worn then more movement is required to make the brakes work efficiently. If all the parts are as new or new then less movement is needed to enable the brakes to be applied. Old and worn parts is the main reason for poor brakes.
Be sure the reservoir capacity is sufficient for the master cylinder needs and allow for pad wear. Caliper piston bores can collectively account for quite a lot of fluid and as the pads were this volume of fluid required will increase.
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