What is brake noise?

Brake noise typically originates from vibration on a part within the wheel end section of the vehicle – between the tyre and the connection to the chassis.

Noise is often blamed on the brake pad itself, but can come from any part, from the wheel bearing to the ball joint. Within the brake system, it’s normal to have some vibration, but it is not usually intense enough to be audible.
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http://www.ferodo.com/en-global/TechnicalSupport/TechnicalTips/Pages/Brake-Noise.aspx