<VV> Dual master cyl

[Clark Hartzel]

I think what Ray is after is a schematic of the master cylinder and the
switch that indicates one side or the other has failed.
I have often wondered myself how a dual cylinder works.  Is there a spring
that applies the front piston? 
How can you get equal pressure if the thing has two pistons?
The entire world ran on single cylinders for 67 years?  I have only owned
one Corvair with a dual master and the brakes never felt "right" on it.
Clark Hartzel