Brake drum skimming

Submitted: Friday, Sep 09, 2011 at 18:04
ThreadID: 127598 Views:2149 Replies:3 FollowUps:1
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I am in the process of doing new brake assemblies and bearings. Inside the drums where the magnets contact the surface it is "furrowed". Does anyone know if this surface needs skimming? Thanks in advance.
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Reply By: Col & Diane - Sunday, Sep 11, 2011 at 05:54

Sunday, Sep 11, 2011 at 05:54
Depend on the amount of wear I guess, but in my opinion if the magnets are worn and need replacing, you should have the drums machined as well, however if you do not intend to replace the magnets at this stage then don't do the drums yet. I replaced all the magnets and had the drums machined on our BT last year. This is my opinion only, and I'm not a mechanic.


Col and Diane.
AnswerID: 583078

Reply By: Pam and Les - Friday, Sep 16, 2011 at 08:13

Friday, Sep 16, 2011 at 08:13
Update. Both rear wheel drums were badly scored on the metal surface where the magnets contact. Front wheels fine. Took the rears to my mechanic for skimming. He found that both hubs were out of round, “left to right” as you look at the drum from the end of the van. Upon further investigation he found that the fault lay in the mating surface where the hub bolts onto the drum. The drums are two piece. Machined these two surfaces back to true. He believes the scoring occurred on every revolution, the magnet would make contact with its mating surface at the high point.
AnswerID: 583079

Follow Up By: grumpyolephartz - Friday, Sep 16, 2011 at 23:21

Friday, Sep 16, 2011 at 23:21
Hi Pam and Les, did you hear anything of the grinding noise that you should have when the windows were open? It could have been of course only when turning if the bearing surfaces were worn.
Regards from us grumpyolephartz, mostly John, but may be Heather

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FollowupID: 853866

Reply By: Pam and Les - Sunday, Sep 18, 2011 at 03:31

Sunday, Sep 18, 2011 at 03:31
No, bearings were fine, worn a little but as expected. It was the drum surface where the brake magnet makes contact that was badly worn away.
AnswerID: 583080

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