BEFORE throwing $$$$ check the actual vacuum. Have to look up the "spec.", I would GUESS 15", give or take.
This will show that the vacuum pump is working, reservoir is intact, the lines aren't leaking, and that the booster hasn't failed in a way that it's leaking and vacuum can't be built up.
Some years back a customer with a "tonner" had poor brakes and the light lit on the dash, turned out to be that the vacuum reservoir (a Ford "tomato juice can" special) had a pinhole rusted in it.
I don't know if yours is set up that way/what reservoir is used, but in any case I would start with a vacuum gauge.
Also, is the brake/low vacuum light in the dash working?
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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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