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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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