Brake Problems 78 FJ 40

Sep 15, 2007
Big Bear, Ca
I have a 78 FJ40 with the stock power disc/drum brake setup and the rear wheels will lock up first when braking hard. I have bled the system and adjusted the rears and still the same results. I am guessing the proportioning valve is not working right. has any one used an adjustable valve? I was thinking of trying an adjustable proportioning valve from summit racing.
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