Re: Proportioning valves
Have you pulled the drums and inspected things? I had an issue with the rears locking up many years ago. Shop said the slave was leaking and getting onto the shoe. Seems contrary and I would have thought otherwise. They replaced the "leaky" slave and it stopped. But could be they saw me coming adjusted the brake and sold me a few extra parts. Just offering up a possible idea that I can't fully confirm. Maybe too much iced tea this afternoon.
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