As seen on Mountain Flyer online:
I love disc brakes. LOVE THEM! They’re more powerful than rim brakes, less affected by inclement weather and new rotors are a lot cheaper than new rims. That being said, one of the things that annoys me the most is when my disc brakes rub. Partly it’s that I don’t like doing more work than I need to, but mostly it’s the noise. I hate riding along and hearing “schwing, schwing, schwing” or, even worse, a single high-pitched note as if my brakes are trying and failing to sing.
Luckily, it’s pretty easy to center your disc brakes and make them stop rubbing. In the following video, I explain the three methods that I have found to be the most effective and at the end talk about straightening a bent brake rotor.
As always, if you don’t like videos, here’s a non-moving-picture explanation: