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brake rotors and finned drums minimum size

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  • Brakes: brake rotors and finned drums minimum size

    What is the minimum requirement thickness of both the rotors and finned 11" brake drums. I have recently got an ammco brake lathe and can not find this as there is not any on the castings.The rotors are off an avanti and the drums are hawk.Thank You, Don

  • #2
    I believe, somewhere it is written, that .330 is the minimum thickness. My 2 original rotors have never been turned ( 145K miles) and they measure .333 from the original .375 (3/8").

    There is a written spec ( even on the drum, I've seen), however the drums also have a bevel on the inside diameter of the wear surface. As the wear surface gets maintained by turning the drum, the bevel will go away and once gone is the point where you trash the drum. Continued use will only cause warpage and a lot of grief. (I think the spec says .060 oversize is minimum)
    Last edited by 64V-K7; 04-01-2020, 06:22 AM.
    64 GT Hawk (K7)
    1970 Avanti (R3)

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    • #3
      I am thinking some 10" drums have a stencil in the outer edge that says 10.090 is max. Will look later while in the garage, but pretty sure it's .090" over.

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      • #4
        Originally posted by JoeHall View Post
        I am thinking some 10" drums have a stencil in the outer edge that says 10.090 is max. Will look later while in the garage, but pretty sure it's .090" over.
        You are probably right.... 060 upside down is 090...
        64 GT Hawk (K7)
        1970 Avanti (R3)

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        • #5
          Originally posted by DMB-8 View Post
          What is the minimum requirement thickness of both the rotors and finned 11" brake drums. I have recently got an ammco brake lathe and can not find this as there is not any on the castings.The rotors are off an avanti and the drums are hawk.Thank You, Don
          Don't have the answer. Always wanted an Ammco brake lathe. Did you get the small arbor with it for the rear drums?
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          Claude Chmielewski
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          http://www.studeski.com
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          • #6
            I did not get a small arbor for the rear brakes.I wondered how to mount them now I understand.Thank You,Don

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            • #7
              The shop that I worked in for a few years had an older Ammco. He could also reface flywheels, with a grinder that attached to the same arm as the cutting tool. The grinder turned the opposite direction as the flywheel, and did a beautiful job.

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              • #8
                The Arbor you need was also used on VW's, less than 1 Inch.
                StudeRich
                Second Generation Stude Driver,
                Proud '54 Starliner Owner

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