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 When you remove the brake drum, check its interior for leak of oil from a gear wheel. 
 
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 Also check the back party of a brake plate for oil leak. If oil leak is found, replace a faulty oil epiploon. 
 At any opportunity to check an oil epiploon at analysis, check its edge for wear. If leak of oil or wear of edge is found, replace a faulty oil epiploon. 
 
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