Re: Proportioning valves
 

SRU1436
Thanks for the link.
There is a cut away there. I did pull the end off the valve and it appears to have a cup on the end like you see in drum brake wheel cylinders. Except it is facing the wrong way to keep fluid in. I was wondering how if functions? However, the cut away shows an "O" ring that doesn't exist in mine. I highlight it with and red arrow. The aftermarket replacement shows no "O" ring in this area. I need some more information at this point.
I did find the 260-11322 Wilwood Brakes Brake Proportioning Valve Non-Adjustable https://www.summitracing.com/parts/wil-260-11322. I am thinking this may be the fit and function I need.
I will check on it again in the morning.