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Old 05-23-2008, 10:06 PM   #1
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Turning electric drums

I'm in the process of replacing 3 backing plate assemblies and am looking at the first drum I pulled off. These units had round magnets and the new backing plates have oval magnets. Should the drum be turned if the armature surface is uneven but the brake shoe surface has no irregularities? If so, I sure picked the wrong day tomorrow to have it done.
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Old 05-23-2008, 10:12 PM   #2
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Craig, both friction surfaces need to be straight and relatively smooth. A gouged friction area for the magnet will cause the brakes to apply unevenly, and the new magnets will wear into the grooves that are present.
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Old 05-23-2008, 10:17 PM   #3
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Quote:
Originally Posted by davidz71
I'm in the process of replacing 3 backing plate assemblies and am looking at the first drum I pulled off. These units had round magnets and the new backing plates have oval magnets. Should the drum be turned if the armature surface is uneven but the brake shoe surface has no irregularities? If so, I sure picked the wrong day tomorrow to have it done.
Mixing round and oval magnet backing plates will give you a brake pull.

You cannot mix the two.

Andy
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Old 05-23-2008, 10:35 PM   #4
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Originally Posted by Inland RV Center, In
Mixing round and oval magnet backing plates will give you a brake pull.

You cannot mix the two.

Andy
Thanks Terry and Andy. I thought this might be the case. Andy, the fourth backing plate was replaced last October after my east TN. brake mishap. It was a Dexter oval magnet just like the other three I am working on now.
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