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Re: Brake vacuum
I have an 11" brake booster on my 65 Suburban 283. Every time I stepped on the brakes the booster stole all of my vacuum (15"). the booster wanted 18", so bad brakes and vacuum advance swung all over the place resulting in a bad running engine. installed a separate vacuum pump for the booster and now everything works fine. Vacuum for the timing is manifold vacuum. No other vacuum demands except PCV
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