Cleaning Contaminated Rotors

Discuss light weight issues concerning road bikes & parts.
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gwilson
Posts: 41
Joined: Fri Jul 06, 2018 3:41 am
Location: Canada

by gwilson

Hi All,
I made a mistake last week washing my road disc bike and ended up getting bike cleaner on my rear disc rotor. Unsurpisingly when I went out and rode yesterday the braking power was reduced and it was loud. My pad was nearing the end of its life so I'm just going to replace it, but I can't manage to clean the blackish/oily residue off the rotor where the pads touch. In the past I've always used rubbing alcohol on paper towel to clean the rotor, but it doesn't seem to be doing much. Does anyone have any suggestions of how I can properly clean it? They're Ultegra 8070 brakes and RT800 if that makes a difference.

by Weenie


Attermann
Posts: 385
Joined: Sun Jan 05, 2014 11:04 pm
Location: Denmark

by Attermann

just some sandpaper, works like a charm.

gwilson
Posts: 41
Joined: Fri Jul 06, 2018 3:41 am
Location: Canada

by gwilson

Attermann wrote:
Tue Aug 20, 2019 3:06 pm
just some sandpaper, works like a charm.
On the rotor itself? I've read people using it on the pad before, but not the rotor. Is there a certain kind of sandpaper you'd recommend?

kode54
Posts: 1622
Joined: Tue May 23, 2006 9:39 pm

by kode54

i clean with either brake cleaner if really dirty or wipe down with isopropl alcohol.
- Factor 02 Disc + DA9170 + Enve 4.5AR CK CL hubs
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Hexsense
Posts: 935
Joined: Wed Dec 30, 2015 12:41 am

by Hexsense

rubbing alcohol first then Acetone or brake cleaner or White Lightning Clean Streak.
I've never really use pure Acetone though, more likely just go directly to White Lightning Clean Streak.

* There are multiple type of brake cleaner, some are weak, but also some are simply Acetone + Heptane, which will be more effective than pure acetone.

mattr
Posts: 4673
Joined: Fri May 25, 2007 6:43 pm
Location: The Grim North.

by mattr

Don't use automotive brake cleaner unless it's oil free. (Many brands contain a light oil to protect the disc from surface corrosion, auto brakes get hot enough, quick enough to burn it off.)

Electrical contact cleaner does a similar job and is almost always oil free.

moyboy
Posts: 447
Joined: Thu Aug 18, 2016 12:19 am

by moyboy

Acetone worked for me, do it until the rag is clean.....

Schadenfreude
Posts: 39
Joined: Sun Feb 10, 2019 10:47 pm

by Schadenfreude

gwilson wrote:
Tue Aug 20, 2019 3:32 pm
Attermann wrote:
Tue Aug 20, 2019 3:06 pm
just some sandpaper, works like a charm.
On the rotor itself? I've read people using it on the pad before, but not the rotor. Is there a certain kind of sandpaper you'd recommend?
80-120 grit wet and dry sandpaper. I had howling disc brakes recently. New pads and sanding of the rotors, followed by 30 mins of bedding in the pads, seems to have solved the issue. I'm pretty sure I've read that you should sand the rotors after putting in new brake pads - I could be wrong though.

TobinHatesYou
Posts: 4188
Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

Clean Streak or the Finish Line yellow can...basically the same thing. You’ll need to bed your rotors / pads in again.

icantaffordcycling
Posts: 433
Joined: Wed Jan 09, 2019 5:03 am

by icantaffordcycling

"Squeal out" is a really good rotor resurfacing product.
Specialized Allez Sprint
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none
Posts: 148
Joined: Mon Dec 17, 2018 11:29 pm

by none

This is what I use, even on cars & motorcycles.
Safe to use on brake pads, too.
Image

by Weenie


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