Why do disc brakes squeal?

Disc brakes offer safer stopping but there can be a big drawback, noise.

There’s no denying that disc brakes hold a lot of performance benefits over rim brakes and anyone that has used them can’t help but be impressed by the levels of power and control the technology can provide the rider. But as many rider can attest to, a disc brake can have one major chink in it's armour...

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