Of course, you're right. Shuttle valve was the name I was looking for. This is the one that limits braking to one end or the other when it "clicks" because of a pressure differential between the front and rear brake systems.
This is the one people often take out when they redo the system.
Sorry, pic is hard to read due to size limitations. Just search "Pantera shuttle valve" and it will show you a good pic.
Mike
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.