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You could rebuild it and keep it as a spare for a while. Then sell it later if it seems to be taking up too much space or is not needed.
I am not certain where I got it but that valve has been dismissed as unnecessary
My check engine light stayed on so long, I can;t remember when it finally burned out :/
I've had issues with RABS valves in the past too and I just eliminate them. Good, bad or otherwise you just need a union fitting to do it... easy. Remove the ABS light bulb from the cluster if it comes on (usually it doesn't.) Obviously you will have no ABS then... but my experience has led me to believe that early ABS on our trucks is just about useless anyway.
I thought you said you had good flow out of the master in post #3?Replaced the rabs modulator and still don’t have sufficient pressure to the rear to activate the brakes.
Maybe I need a new master?
I thought you said you had good flow out of the master in post #3?
What about raising the rear and let the wheels spin, does it work then? On both sides equally?