That's the way I understood it. And from what I can tell, since I have the old style brake chambers, I will have to use a 7 port relay valve so the trailer tank air pressure will set the brakes when the supply from the tractor is removed. My valve is so old that I'm having trouble finding one. It's very similar to a Spearco A1000, and it seems it will interchange. There's tons of valves that will fit, but they lack the secondary supply port that I assume releases the park feature when tractor supply is applied. I'm gonna take the valve off today and look it over for some part numbers. It has the separate brass valve in the center like the Spearco, so that might be what it is.
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Today's Featured Article - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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