<VV> Shuttle Valve? - Probably not the master cylinder

[Jack Kean]

I just looked at my GM parts catalog. They have very good exploded views 
of each type of master cylinder. Unfortunately, my catalog is a pre-67 
version, so the dual master cylinder is not listed in it. Maybe someone 
with a complete parts catalog could post a picture.

regards,
jack kean

On 12/28/2010 12:47 PM, BBRT wrote:
> It is my understanding that the block is a shuttle valve which has a rod
> with o-rings on each side. In the rod center is a groove which a plunger
> attaches to which will cause the indicator to light if it goes one way or
> the other. Upon one circuit failing, the rod goes to one side and blocks the
> fluid from going to the other  brake circuit, if working correctly.
>