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 Post subject: Glazed brakerotors
PostPosted: Mon Feb 27, 2017 2:46 pm 
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Joined: Tue Oct 04, 2011 5:04 pm
Posts: 490
I'm placing this here as it could be an MTB, cross, gravel, touring or road topic. Mods, please feel free to place it somewhere else if needed.

It looks like the Hope floating rotors I have are glazed. Their braking performance is only so-so and in the wet the squeal enormously. Removing glaze from motorbike and car rotors seems like a simple affair by just cleaning and sanding them with a light grit but I'm curious if anyone here has ever done it or knows a method to recommend.

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Last edited by Tomstr on Tue Feb 28, 2017 9:42 am, edited 1 time in total.

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 Post subject: Glazed brakerotors
Posted: Mon Feb 27, 2017 2:46 pm 


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 Post subject: Re: Glazed brakerotors
PostPosted: Mon Feb 27, 2017 4:03 pm 
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Joined: Fri Dec 24, 2010 9:37 pm
Posts: 1028
Location: it's raining, it must be uk
glazed rotors would be odd i think, usually just contaminated, use solvent to get them totally clean - then if something has got melted onto them you should be able to see it and decide if mechanical removal really is needed

glazed pads more likely, but i's start by trying just degrease

if still no good, use very fine abrasive, then fully degrease as well, make sure abrasive is flat and applied parallel to the pad face


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 Post subject: Re: Glazed brakerotors
PostPosted: Mon Feb 27, 2017 8:44 pm 
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Joined: Wed Dec 30, 2015 4:04 pm
Posts: 105
like sungod said, just use alcohol with lint free rag.


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 Post subject: Re: Glazed brakerotors
PostPosted: Tue Feb 28, 2017 1:40 am 
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Joined: Sat Oct 09, 2010 11:42 am
Posts: 93
Most rotors will moan and groan in the wet but have you tried using a squeal stop compound behind your pads (between the pads and pistons)? Doesn't last forever but takes two minutes to do and works incredibly well for as long as it lasts. I use red boat trailer bearing grease.

Alcohol and a clean rag do great for occasional cleaning of the rotor itself. After really nasty rides or other particular abuse, a scrub with an abrasive pad works well. Follow that up with alcohol and clean rag, and then you'll need to do a quick re-bed.

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 Post subject: Re: Glazed brakerotors
PostPosted: Tue Feb 28, 2017 9:42 am 
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Joined: Tue Oct 04, 2011 5:04 pm
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Thanks for the advice guys. I thought it was strange too but as the rotors are only 1.6mm thin heat buildup can be real.

I'll give them a good clean with alcohol and take the pads along with it. The grease on the back of the pads makes sense too, works great with cars etc. I have some copperpaste/antiseize around, that should do the trick.

If that doesn't get them braking well I'll get the Mavic sanding pad out. Should work well for discs too. :)

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 Post subject: Re: Glazed brakerotors
PostPosted: Tue Feb 28, 2017 10:05 am 
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Joined: Fri May 25, 2007 6:43 pm
Posts: 3046
NovemberDave wrote:
I use red boat trailer bearing grease.
Check that it's compatible with the seals. The whole DoT/Mineral/LHM/whatever issue applies to grease on the other side of the seal as well.

Copaslip does a pretty good job and doesn't affect either type of seal.

And you can probably exceed the liquification point of most greases in a braking system, so you'll get runny grease exactly where you don't want it.
Copaslip is "better" but you may still get some of the components melting, not sure what the make up is of most copaslips, the one i have now pretty much drys out after 24 hours and is good to several hundred degrees, no greasiness left, the last stuff i had was actually a copper loaded grease, so stayed greasy forever and you'd get the grease running out at high temps (but leaving the solids behind).

If that makes sense.


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 Post subject: Re: Glazed brakerotors
PostPosted: Tue Feb 28, 2017 10:58 am 
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+1 for Copaslip. It's widely used in the metal industry for good reason.

A lot of bike grease products are rebranded from the metal industry anyways so it makes sense to see what the hardware store can supply.

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 Post subject: Re: Glazed brakerotors
Posted: Tue Feb 28, 2017 10:58 am 


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