Thread: Aluminum Buick Brake Drums

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Originally posted by sparky2263
Generally speaking, most drums were a certain inch diameter with .060" the max diameter to be added through machining. I have exceeded that spec many times BUT had access to a shoe arcing machine. Arced the shoes to perfectly fit the enlarged drum. Otherwise you have prolonged seating time for the rear shoes due to the enlarged diameter.

in VA. its against the law to turn the drum over the max. for safety reasons. we have to check them on st. insp. and if they have been turned over the max. then we have to reject them.

ps- thats the reason it is stamped on the drum Delaney, so the mechanic will know what it is without pulling a book out everytime.