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Re: 81 Caddy Diesel Brake Vacuum (ctmulder)

You should have at least 20" of vacuum at the brake booster at idle... approximately the same as the manifold vacuum you'd expect from a gasser.
There are two styles of vacuum pump... one with rotors which rarely has a problem and an older style with a diaphragm that can break.
We'll hope it's the vacuum pump and not the booster... evidently Caddy boosters are NLA and getting hard to find.
 
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