Stock Brake Proportioning Valve Adjustment? (1 Viewer)

Dec 29, 2016
Orlando Florida
Hey Guys,
I have read through a bunch of threads on this topic but can't seem to find the simple answer. I have a 79 FJ40 with front discs and drum rear, recently I have been noticing when I have to lay into the brakes the rear drums lock up pretty easily. I know there is a stock proportioning valve mounted underneath the rear of the master. My question is, is that valve adjustable? if so what direction reduces and what direction increases? If not, does someone have a suggestion on a quality aftermarket adjustable valve? I have been looking at this one from Russel if it needs to be replaced and upgraded.
Add-on Brake Proportioning Valve - JTOutfitters
Thank you in advance

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