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Offline Dmcfadyen

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Lubricating the disc brake bobbins
« on: March 19, 2015, 06:14:40 pm »
Hello all, what's the best product to use when lubricating the bobbins on the front discs. I cleaned them using brake cleaner and they turn no problem with a small bolt tightened and turned with a spanner but I can't get them free enough to turn using my fingers alone. Folk have suggested 3 in 1 oil and another said silicone lubricant. I have a decent amount of movement in the actual discs but the bobbins still seem really tight.

Thanks, Donald

Offline davidcumbria

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Re: Lubricating the disc brake bobbins
« Reply #1 on: March 19, 2015, 07:02:54 pm »
Ok I 'll weigh in first expecting to get shot down but I don't think you should try to lubricate them and have never heard of anyone trying. You don't want lubricant to spread onto the disc for obvious reasons and the heat generated by braking would evaporate most substances anyway.

If the discs can be rattled on the bobbins with only moderate  hand pressure you've done your job. :002:

Offline seadog

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Re: Lubricating the disc brake bobbins
« Reply #2 on: March 20, 2015, 08:05:51 am »
I have just serviced the brakes and checked the movement on the bobbins. I did very carefully use oil spray mindful of it getting on the discs. This cleaned then. I then thoroughly cleaned with Brake cleaner spray.

As David said if you can move the disc by hand and you know all bobbins are free then it should be OK

Remember the first time you brake will centralise the disc.

seadog
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Offline Dmcfadyen

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Re: Lubricating the disc brake bobbins
« Reply #3 on: March 20, 2015, 04:56:54 pm »
Thanks to you both. I'm getting this intermittent rumble when I apply the front brake and when I ndone all the bobbins it went away but it comes back now and then and I was thinking I should have lubricated them as well. As the shudder or rumble is not all the time I don't think I have warped discs or it would be there all the time. I'll try a tiny bit spray oil to be sure in my head that they are moving as they should when I apply the brake.

Thanks Donald

Offline AVI.INC

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Re: Lubricating the disc brake bobbins
« Reply #4 on: March 20, 2015, 10:52:29 pm »
Centrifugal force will pull anything you put on the bobbins towards the outer edge and if it's an oil that would not be a good thing.
I must be going too fast for too long evey time i get back i'm younger!!

Offline seadog

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Re: Lubricating the disc brake bobbins
« Reply #5 on: March 21, 2015, 07:15:49 am »
Everybody has a duty of care to there own safety if they work on there own bike. If any one is stupid enough to leave oil on there discs then they should not be doing there own servicing.

I was just describing how I did my bobbins and cleaned after with brake cleaner.

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Offline Gordon3xBBB

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Re: Lubricating the disc brake bobbins
« Reply #6 on: March 21, 2015, 07:27:32 am »
Does Warping of the Discs have anything to do with the Bobbins becoming less free over time I wonder ?
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Offline Trophy Tom

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Re: Lubricating the disc brake bobbins
« Reply #7 on: March 21, 2015, 11:06:53 am »
Ok I'm a dummy but what are bobbins?
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