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7_Zero · 12-10-2015, 12:26 AM

What is the maximum allowable diameter of cast iron brake drums?

My brakes were pulsating so I had them turned, they ended up being 11.060". Everything that I found here on the barn states that the limit is anywhere from .060"-.070" so I decided to get some new drums. The new drums arrived and they are already .065" over. I called the supplier and they said that it was fine as the new cast iron drums are thicker and can be turned .195".

If this is correct, I just wasted some good drums! If it is not, then I just received some drums at their limit. Any insight would be appreciated, thanks!

12-10-2015, 12:26 AM	#1
7_Zero Senior Member Join Date: Feb 2014 Location: Northern Utah Posts: 103	Maximum diameter of cast iron drum? What is the maximum allowable diameter of cast iron brake drums? My brakes were pulsating so I had them turned, they ended up being 11.060". Everything that I found here on the barn states that the limit is anywhere from .060"-.070" so I decided to get some new drums. The new drums arrived and they are already .065" over. I called the supplier and they said that it was fine as the new cast iron drums are thicker and can be turned .195". If this is correct, I just wasted some good drums! If it is not, then I just received some drums at their limit. Any insight would be appreciated, thanks!