<VV> Dual or single master cylinder

[NicolCS at aol.com]

It sounds like you have a stuck combination valve. CN
<snip> JVHRoberts wrote: Not to be argumentative, but I did the mashing 
thing, and it still went to the floor. Not the case with the Subaru and Nissan 
brakes. It went down on those cars, but not to the floor, and I had plenty of 
pedal to lock up the other circuit, presumably... <unsnip>
Argumentative???  I think we are just discussing the symptoms and trying to 
match 'em up with how the hardware is supposed to work.  I don't think GM would 
have designed it to not work; I think your car failed to work properly.
CN agin