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1958 A-120 Brake Drum

PostPosted: Tue Dec 05, 2017 9:50 am
by grubby65
I would like to get my rear brake drums turned on my 1958 A-120, RA-10 rear end with 12"x2" brakes. I was wondering if anyone had the "maximum diameter" specs for these drums.

Re: 1958 A-120 Brake Drum

PostPosted: Wed Dec 06, 2017 12:01 pm
by 1975IH200
Brake drum maximum diameter dimension is typically cast into the edge of the drum.

Re: 1958 A-120 Brake Drum

PostPosted: Wed Dec 06, 2017 7:20 pm
by dean466
1975IH200 wrote:Brake drum maximum diameter dimension is typically cast into the edge of the drum.


It has been for a long time, but I don't know that they were doing that in 1958. I didn't find any diameter markings on the drums from my '56 S120.

Dean

Re: 1958 A-120 Brake Drum

PostPosted: Wed Dec 06, 2017 7:46 pm
by lbesq
Unless they are so chewed up that you can never use them without taking them down to smooth. consider just smoothing them out a bit. even if there are rivet grooves, you can put a thicker material on the shoe itself and they will wear into the groves. Just my thoughts.

Re: 1958 A-120 Brake Drum

PostPosted: Wed Dec 06, 2017 9:10 pm
by 53R110
In PA you can go 90 thousandth over size on truck drums. So 12 inches plus 90 in your case. Not sure if that's true for every state.

Re: 1958 A-120 Brake Drum

PostPosted: Thu Dec 07, 2017 11:21 am
by grubby65
I did find the specification in the shop manual. It states .060" for brakes under 4" wide and .120" over 4"