Inboard area of a master cylinder.

[Otto-813]

Im reading a brake systems book and have gotten into the hydraulic gain section. Although I can figure out the gain ratios with the data thats in the book there is one part they leave n/a on the master cylinder. Heres an example of what it gives

Master Cyl dia/0.75in inboard area/n/a in sq. effective area/0.44in sq.
Caliper dia 2.00in inboard area/3.14in sq. effective area/6.28in sq.

Now from that data the n/a number is right around .585 but where did they get .585 from?

[David Pozzi]

a 3/4" bore has a surface area of .4418" square inches, that's all you need to use.
Any mention of inboard area on a master cyl is an error, - there is no .585

When comparing single-piston calipers to multi-piston calipers, use the sq in bore area for a single piston type caliper, or on a 4 piston caliper use only one side of the caliper. If multiple caliper bore diameters are used, calculate the total bore area in sq in for one caliper half.
David

[Otto-813]

Awesome! Thank you sir!

How do you get the .4418" of the 0.75" cylinder? What is the formula for figuring that out?

[greencactus3]

Awesome! Thank you sir!

How do you get the .4418" of the 0.75" cylinder? What is the formula for figuring that out?
pi*r^2

[Apogee]

pi*r^2

Where pi is a constant approximately equal to 3.14 and r is the radius.

Tobin
KORE3