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 - Tuning-Up Your Tractor: Secondary Ignition Wires and Distributor - by Curtis Von Fange. In our last episode we spent the entire day checking out the spark plugs. Is that efficency? Actually, it took more time to explain than it really did to do the inspection. At any rate we decided that a compression test was in order so we could verify the internal engine status. That way we wouldn't buy any tune up parts until we were sure that the engine was in reasonable mechanical condition. Our tests showed a fictional compression reading of 85, 80, 82 and 86 psi. That is well within a
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