Brake disk getting rusty

Jaloopa · Brolly Dolly Joined: 14 Sep 2007 Karma :

My brake disk gets a very visible film of rust over it when left overnight, even with a cover over the bike (covering it does seem to help a bit, but not hugely).

Most mornings, it's also a little bit seized up, and the wheel won't move without rocking the bike forwards and back a bit.

Two questions:
1 - is it dangerous? When running I never see any signs that the brake is in danger of seizing, but could it happen?
2 - What can I do about it? Oiling on a brake is obviously a bad idea, but is there any other way short of getting a new disk/pads?

The bike is a 1995 Kawasaki ZZR600, if that's important.
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mudcow007 · World Chat Champion Joined: 01 Feb 2012 Karma :

rusty discs are a good sign, means they have a high iron content, its when they dont rust you get worried

normal usage will wear the rust off

dont worry, be happy.....(how many of you just hummed the song??)

Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

Yup, it's fine. But...

wr6133 · World Chat Champion Joined: 31 Dec 2013 Karma :

Are they cheap Chinese aftermarket ones? If so that is a feature, they cost something like £20 a pop in China so that's the quality you get (the £100 added when they make it to eBay is just the round-eye tax).

Jaloopa · Brolly Dolly Joined: 14 Sep 2007 Karma :

mudcow007 · World Chat Champion Joined: 01 Feb 2012 Karma :

also worth remembering loads of salt on the roads at the moment, which will make rusty crustyness look worserer

dont spray em with oil Thumbs Up

mentalboy · World Chat Champion Joined: 05 May 2012 Karma :

wr6133 · World Chat Champion Joined: 31 Dec 2013 Karma :

Nexus Icon · World Chat Champion Joined: 26 Aug 2010 Karma :

There's nothing unusual about it, especially at this time of year. Some mornings my car gives a good crack from the rear discs after the handbrake's been on all night and the film of rust on the disc is broken.

I don't often take the bike out in wet, salty conditions but I'd imagine it would be similar.

Discs are most commonly made from cast iron so they're bound to rust very quickly.
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orac · World Chat Champion Joined: 25 Sep 2011 Karma :

I cant say for other brands but EBC discs (£300 a pair) rust faster than you can "rusty" couple miles and they are fine. another to note is that the HH pads will corrode to the disc if left - I have had it happen over night to some degree, a quick rock back and forth normally frees thing up. sometimes its takes more if left for longer.
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