Disc brake - whirring noise is this normal?

borisface
borisface Posts: 273
edited January 2014 in MTB workshop & tech
Just built a new charge duster frame up and have stuck on some shimano deore disc brakes. I've never ridden with discs before and whilst they are powerful, when applied they make a slight whirring noise - is this normal? Rotors are shimano deore also.

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