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Brakes???

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Brakes

I have a 1955 Mack B61 and as far as I know everything is origional. I rebuilt the brakes a few years ago with new rear drums cast by dura brake. I have the rear brake pots with the big diaphrams and they lock on low air pressure. I don't know what these are called. I don't believe they are spring brakes. Does anybody have a diagram of the system with a discription of how it works. I pulled up to a stop sign the other day fortunatually going very slow pulling my tractor and when I applied the
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