Originally Posted by Ripped
thanks, I was under the impression that some m/c had residual valves built into them
Yes, they do. Many service replacements, however, don't. The flare seat can be removed from the MC by turning a small screw into the orfice, then pulling the entire fitting out.
Here's the seat and valve removed:
Here's a (poorly focused) picture of the valve in the MC after the seat was removed:
Here's an MC with no valve after removal of the seat:
The first MC was from a '67 Mustang, either original, or at the newest from the mid-seventies.
The second MC was a NAPA service replacement for '75-'79 Granada purchased around2004-2005.
As you can see, although the Granada had rear drums, there was no res pressure valve. I don't know how one might figure out if you have the valve or not without physically pulling the seat out. As with most things Ford, nothing is clear or easy.