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Old 09-24-2017, 09:25 AM   #4
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Join Date: Jun 2010
Location: San Antonio, Texas
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Default Re: Distributor vacuum brake question

It is a vacuum controlled retard system to act as a brake on the advance disc under load conditions. It only has braking affect when manifold pressure is high (low vacuum) as was stated. A person can say that it doesn't physically retard the timing but in effect it does so by slowing the advance mechanism.
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