master cylinder sizes?

[David Pozzi]

Here is a previous answer I posted on Team Camaro, it outlines brake analysis proccedure.

Camaro pedal ratio for power brakes is 3.8 to 1, manual brake ratio is 6.25 to 1.

so, to calculate, foot pressure in lbs, X pedal ratio plus booster pressure in lbs = total force on master cyl piston in lbs.

Piston force lbs X piston sq inches = line pressure (PSI). (Sq inch formula: bore squared X .7853982= bore in sq inches)
Line pressure X caliper bore in sq inches = clamping lbs. (Use one side of a four piston caliper piston area or the whole area of a single piston caliper.)

caliper clamp lbs times pad friction coeficient = caliper drag. (pad size doesn't matter here)
caliper drag X rotor (effective) radius to pad center, (not rotor OD) = rotor torque in inch/lbs.
Rotor inch/lbs torque divided by tire radius in inches = lbs of braking force at tire tread.



If you want to do more estimate forward weight transfer and add that to the front wheel load.

Tire loaded weight X tire coeficient of friction = tire limit of adhesion, if brake lbs exceed this, the wheel locks and skids.
David