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Old 09-24-2017, 06:21 AM   #3
JWL
Senior Member
 
Join Date: May 2010
Location: Fitzgerald, Georgia
Posts: 1,981
Default Re: Distributor vacuum brake question

The spring actuated plunger has a leather-like pad. At lower vacuum the pad rubs on the rotating plate and resists the mechanical advance. It does not retard timing, but rather, delays the application of advance.
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