Join Date: Sep 2012
Location: England, Great Britain
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I'm running Shimano Deore hydraulic brakes with Hope floating rotors, the rear doesn't make noise, it just vibrates the *whole* bike under braking. So much so I'm considering selling it as a feature; women specific.
Actual performance isn't lost, from my experience. But I would soak the rotors in de-greaser for a while and then expose them to an open flame. If the cause is oils etc. you'll see it burn off in spectacular fashion.
I've had this problem far too many times, probably due to the fact my other half soaks her bike in lubes etc. every ride, probably not being careful enough and getting it on my bike too.
I would flame the discs and pads, consider buying new pads if performance isn't any better, then be careful with oils afterwards. I've encountered brakes becoming red hot, literally, and after I gave them a while to cool, they were fine.