Ironhead drum brake question....

Discussion in 'Sportster Models' started by Lang, Oct 4, 2011.

  1. Lang

    Lang Member

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    hey everyone,
    does anyone know what the tolerance is on the rear brake drum on a 76 sporty. i need to replace the brake shoes and i see they offer an oversize set for worn drums. but how badly do they have to be worn to need them. and will the oversize still work in a drum thats not too badly worn? thanks
     
  2. the draggin

    the draggin Active Member

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    Wow, I had 77 Sporty but I never heard of oversize shoes. Do you have a service manual?
     
  3. Lang

    Lang Member

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    yeah, doesnt say in the manual. someone tol me that they think the oversize shoes were for drums that have been turned down, not so much worn. i guess i'll just try the stock size and see how they work.
     
  4. Webbtron

    Webbtron Banned

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    I think you are doing the right thing ordering standard shoes. Read how to center the shoes in the manual. It is a critical step.
     
  5. Jack Klarich

    Jack Klarich Expert Member

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    Measure the diameter of the drum, if you know someone with a drum micrometer have them mic it, if you have the drum machined whatever is removed (say.010) have the shoes oversized to match the maching of the drums, I cannot find a spec so I would guess .030-,050 would be a safe guess:s
     
  6. Lang

    Lang Member

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    ok good to know, i was just going to put them back together.

    thanks for the info