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 - Search For Spares - by Anthony West (UK). Following on from the aquisition of the old Fordson F, I was very much in need of spares. As a novice though I didn't appreciate the fact that there were so many Fordson tractors made, that all the other makes seem rare by comparison. As far as I was aware a fordson was a fordson and it was only through trial an
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