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Old 12-16-07, 01:33 PM   #1
temple-lobe
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New Bike - Rusty Brake discs??

Hi All

I've noticed rust has quickly appeared on my brake discs, I'v only had the bike a week!

Is there something I need to apply to the discs to stop them from rusting?

Help appreciated!
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Old 12-16-07, 01:46 PM   #2
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Is there something I need to apply to the discs to stop them from rusting?
Yes, apply the brakes while you ride the bike and the pads will abrade the rotors and take them down to bare metal.

DO NOT apply any substances to the rotors.

As I said, the pads will 'clean up' the rotors with use. Any other rust or corrosion on the rotors should not affect performance.

If you you really have a need to make your rotors look nice, remove them from the wheels and clean them up with medium/fine steel wool. Don't forget to blow away all traces of the steel wool.
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Old 12-16-07, 02:57 PM   #3
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Yep...it's normal...when you use your brakes, it'll all come/wear off, just like a car's disc brake rotors.

If it really bothers you, then buy a can of "3M 16-501 Zinc Spray" (~$8.00). Remove and Clean your rotors of rust and spray it on. Whatever surfaces the pads doesn't contact will be protected...the surfaces where the pads contact will wear the coating off and that's the only place where you will see any rust form (if you don't ride often). The Zinc coating will act as a barrier and sacrificial layer and should last for a long time. Many performance aftermarket "car rotors" are zinc coated, so it not like it hasn't be done before.

Last edited by Sci-Fi; 12-18-07 at 11:45 AM.
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Old 12-17-07, 06:33 AM   #4
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Hi - Thank you for help guys.

Yeah, I ride 3 times a week so I think I'll try that zinc spray you mentioned.

Andy
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Old 12-17-07, 06:42 AM   #5
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Hey fellas - just stopped in to see what's up and was wondering if when you say no substances whatsoever, if that includes alcohol? I use it to clean crud off my rotors during weekly maintenance. I've never had the rust issue (just dirt and grit) and ride in the rain often.
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Old 12-17-07, 09:35 AM   #6
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I also use rubbing alcohol, ride in rain and what have you and never get rust on my disc brakes. A bit of rubbing alcohol to clean them off as soon as I get the bike inside seems to go a long way.
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Old 12-17-07, 09:37 AM   #7
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I've used alcohol as a cleaning agent on rotors as well and never a problem.

Bill J.
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Old 12-17-07, 10:13 AM   #8
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Hey fellas - just stopped in to see what's up and was wondering if when you say no substances whatsoever, if that includes alcohol? I use it to clean crud off my rotors during weekly maintenance. I've never had the rust issue (just dirt and grit) and ride in the rain often.
Obviously you don't want any grease or oil on your rotors. Alcohol should be fine. A lot of people remove their pads if they are going to use a solvent or water-based cleaning agent/solution to clean their rotors and/or calipers...the reason behind it is that nobody knows what short or long term effect a solvent or cleaning solution will have on the pad braking material or the bonding agent that adheres the pad to the backing plate. Shouldn't be a big deal to pull the pads, most will adjust their brakes after cleaning anyways and it's always good to check the pad thickness/wear and replace when necessary.
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Old 12-17-07, 10:24 AM   #9
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Sorry if I inferred 'no substances of any kind'. Those such as alchohol that go away or evaporate should be fine.

Added note- You can clean disc pads on the flat with fine grade sandpaper, don't overdo it. Mechanics in Moab showed this to me when I wanted to get rid of squeal.
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