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What is causing a knocking sound when I apply the brakes? on 1994 GMC Safari

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The knocking sound only seem to be heard from under the back of my van whenever I slow down and come to a complete stop. There is no sound after I stop nor after I resume driving. Sometimes the knock is slow and and rapid. The sound is frequent.
(2) Answers
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brake drums out of round as stated
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Warped brake drum or rotor comes to my mind.
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