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Rough up the shiny surface?
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   Forward Look Technical Discussions -> Brakes, Wheels and TiresMessage format
 
jaded13640
Posted 2020-06-16 6:31 PM (#599763)
Subject: Rough up the shiny surface?


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Posts: 155
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Do you guys "rough up" the contact surface on a brake drum prior to re-assembly?

Mine are super glazed where I had those hard Raybestos shoes on it.

What do you guys do?

Thanks,

Wayne
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samstrader
Posted 2020-06-17 4:23 PM (#599788 - in reply to #599763)
Subject: Re: Rough up the shiny surface?


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Location: Beaumont TX
I don't rough up the drum surface because of an appearance of a glaze, but I have used sandpaper to sand out rough areas on the surface. I think the main thing is to use brake parts cleaner to make certain there is no oil on the surface of the drum or the shoe.
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jaded13640
Posted 2020-06-17 5:29 PM (#599793 - in reply to #599763)
Subject: Re: Rough up the shiny surface?


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Yea, I hear ya, and I ordinarily wouldn't either but in this case they've been running with REALLY hard lining material for about 3 or 4 years. I've actually never seen a drum quite as shiny as these. They're like super, highly polished.

Thanks,

Wayne

Edited by jaded13640 2020-06-17 5:30 PM
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Viper Guy
Posted 2020-06-17 8:25 PM (#599797 - in reply to #599763)
Subject: Re: Rough up the shiny surface?



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Location: Branson, MO
Just a comment that may be of value. When brake drums and rotors are turned, they are never polished/shiny - always a bit scuffed looking when finished. Nothing ever said to me about further preparation necessary before installation.

The brake shoes themselves are "roughed" up a little and the leading edge chamfered a bit.
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jaded13640
Posted 2020-06-17 9:38 PM (#599799 - in reply to #599763)
Subject: Re: Rough up the shiny surface?


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Posts: 155
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Yep, when I did brake turning, rather than leave the nice smooth machined finish we used an attachment that held and rotated a scotch-brite that left a slightly "scratched up" surface to it. I'm going to use a scotch-brite on my air angle grinder. I don't know if it'll even rough them up because of them being just so overly polished because of the use of the harder than honeymoon dingy lining. We'll see.

Thanks,

Wayne
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