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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