Re: A Spec for Turning Brake Drums

Posted by HH56 On 2018/7/9 9:16:10

As James said in your Duchess thread post, the rule or maybe it is law is that shops cannot turn more than .060 from the specified original diameter. I couldn't find any precise starting spec other than Packard says rear drums are 12". That is for the regular cars but if the limo has a larger drum then they didn't' call that one out in the regular service counselor spec page or in prewar SMs. I suspect just like torque specs and other guidelines taken for granted today, Packard didn't worry about publishing those kind of numbers.

Here is a small snippet from a longer post on shop do's and don'ts as printed on a brake repair site.

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