Originally Posted by WhyFi

I had a squeal a couple weeks ago; my rotor was evidently contaminated while sending a wheel off to be rebuilt. It was a matter of minutes to pull the wheel, wipe the rotor, pull the pads and sand them on a diamond plate (though a piece of sand paper on a kitchen counter would work just as well), and re-install. The process was certainly no worse than cleaning metal shards out of rim brake pads.