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How do you do math calculation to determine drum ware or mesurmewnts from cam rotation on semi truck and trailers?
Build your air pressure up release your brakes and chock wheels.Back off slack adjuster just until it starts to pull out push rod from brake chamber (POT).Be carefull some auto slack adjusters have a prawl that has to be pulled out to back off brake.It will be right by the bolt that adjusts brakes.When you reach the point where the push rod starts to come out of the brake chamber,the brake is backed off as far as it will go.Make a mark on the end of your S cam and and on the slack adjuster.Adjust the slack adjuster tight to the brake drum.Any more than 120 degrees difference from the mark on the S cam and mark on slack adjuster is a fail.You can't determime the drum wear as the travel will vary depending on the thickness of the brake shoes.But this how inspection mechanics determine drumwear,with out pulling the wheels.If you have say 5/8"of brake shoes and are getting close to 120degrees your drums are probably over limit.If your brake shoes are at low limit of 5/16"your drums will probably be close.Keep in mind that 120 degrees of travel is a fail.Worn S cams,bushings,and slack adjusters can also effect travel.
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