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rvtroubles

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Posted: 02/26/12 07:28pm Link  |  Print  |  Notify Moderator

I had the drums resurfaced and new magnets installed last year.We took a 3000mi trip. When I checked the brakes this year both the magnets and the magnet contact surfaces on the drums were deeply grooved. My question is,WHY? This is on a 1999 Artic Fox,24ft 5th wheel.
Please,your help is appreciated. Thanks

skipnchar

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Posted: 02/26/12 07:53pm Link  |  Print  |  Notify Moderator

Can't tell you WHY but that's a painfully low mileage to be showing any visible signs of wear. Could it be that they only resurfaced the braking surface not the side of the drums?


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chinook507

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Posted: 02/26/12 08:48pm Link  |  Print  |  Notify Moderator

Did you by chance have grease leak out and get all over the insides of the drums?


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mike4947

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Posted: 02/26/12 09:59pm Link  |  Print  |  Notify Moderator

We've seen this a couple of times. Mostly it's caused by a stray voltage being applied to the brake wires. Most common cause is a short in the 7 pin connector. Either from dirt or a bad wire. Usually it's a low voltageshort and causes wear on the magnets/surfaces, but not the actual linings or main drum surface. Espwcially if the brakes haven't been adjusted.


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Posted: 02/27/12 03:31am Link  |  Print  |  Notify Moderator

Are you sure the magnet surface of the drum was turned?? Not all shops have the ability to turn this vertical surface and can only turn the outside surface where the shoes contact. If you had this work done and did not do it yourself I would question the validity of this surface being done!!

jasult

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Posted: 02/27/12 03:44am Link  |  Print  |  Notify Moderator

Hi Guy - Can't be sure but if you have no problem pulling it apart to check it why did you not just replace the entire backing plate as a kit and install new drums for same cost you paid a shop to do the work? You did the hardest part of jacking up and pulling apart.
These backing plate kits come with everything new and shoes and springs installed. Just unbolt old and install new and drums and done.

Here are some to check out and most local trailer shops carry them
Trailer brake kits

* This post was edited 02/27/12 03:50am by jasult *


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jasult

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Posted: 02/27/12 03:44am Link  |  Print  |  Notify Moderator

Double post

Chris Bryant

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Posted: 02/27/12 05:02am Link  |  Print  |  Notify Moderator

Likes to tow wrote:

Are you sure the magnet surface of the drum was turned?? Not all shops have the ability to turn this vertical surface and can only turn the outside surface where the shoes contact. If you had this work done and did not do it yourself I would question the validity of this surface being done!!


That would be my bet as well.


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Wills250psd

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Posted: 02/27/12 05:07am Link  |  Print  |  Notify Moderator

eastern marine has the parts cheap

mapguy

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Posted: 02/27/12 09:38am Link  |  Print  |  Notify Moderator

Deep scores may be real minor issue in the overal scheme of things. Deep scores are only a problem if damaging the magnet core and or the wear pattern is not proper. Magnet condition and drum magnet surface must be in harmony. New magnet needs fresh magnet drum surface. Old magnet needs the drum surface to stay the same to match the existing magnet.

Not sure which brand of brake is on your trailer but the Al-Ko Axle manual is at the link below. See page 17 for magnet info. Similar information for Dexter Brakes is available on the Dexter Axle website.

2-7K Al-ko Owners Manual

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