What is your question?
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What is your question?
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Forward rotation of the drum tries to rotate the brake shoes as well... The gist of it is --- The shorter primary shoe actually helps push the longer secondary shoe toward the drum for increased friction, it needs the help of the primary shoe to be more coefficient... Just remember the short shoe lining faces the front of the vehicle and the long shoe lining faces the rear!!!.. That's most important!
So what I'm understanding is that the increased coefficient of friction between secondary shoe and drum is made possible by the longer total lining.