I am not sure what you are asking but the proportioning valve works like all brake prop valves directs brake fluid to the calipers. That being said these early 4 wheel disc brake set up on 79-81 TAs were not the easiest to work with. Have you recently rebuilt your calipers and need to bleed? The rear calipers are the tricky part usually and needed to be set up correctly with emergency brake cables. Is your brake light on and got tripped on proportioning valve?
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going bandit-Reynolds style
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