The valve that you are showing us from Ricks is called a Metering Valve and it’s different from the Proportioning Valve. This valve can not under normal conditions get stuck, this valve should help bleeding the rear brakes, this valve slows the flow of brake fluid to the front, by doing that you basically increase the flow of brake fluid to the rear. I would not mess with this valve unless you are having front brake issues.
Factory Camaro’s should also have another valve, this valve will have both the front and rear lines plumed thru it, this valve is called a Pressure Differential Switch! It is possible for this valve to get stuck and restrict fluid flow and can be centered with a small paper clip and can be test to see if it’s stuck with a simple test light.
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