The steel surfaces of the inner brake drum, both sides of the actuator, and the bull pinion carrier, are worn from 60 years of use and abuse.
What's happening is the actuator is going past its limit, making the bang you hear.
The fix is to take the brake drum to a machine shop and have them mill the edge down. I don't know the spec off the top of my head, but with the two brake disks and the actuator stacked in the drum, lay a straightedge across the edge of the drum and measure down so many thousandths.
O.E.M. Tractor Parts used to offer this service IIRC. They would send you a replacement drum, actuator, and new disks milled to spec, and you would mail back your old drum and actuator as a core for minimal downtime, or you could send yours in.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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