The brake faure switch in the brake system distribution block you're talking about used to occasionally need manual resetting in the early versions of the traingular braking systems in the 140s, 240s and early 700s. The switch would ride up on the end of the taper cyclinder and not go back down into the shallow middle. In the newer distribution blocks, the switch is no longer a problem and almost always properly resets after a warning.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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