Someone knows how big the spring sonstant and damping factor are?

I'm just interested in the spring constant and damping factor of the master cylinder in the braking system. Someone, please just give me some Info, tables about it or how to estimate it?
Many thanks~~

Answers:
You could remove the master cylinder, drain it, and compress the piston against a bathroom scale or the like; that might give you an idea of the spring constant. The spring is not very strong, though.
Which braking system?

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