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It almost sounds like the rotor is rubbing against something creating a lot of friction, but you'd most likely be able to feel that. Something similar happened on my Escalade and my front passenger rotor and rim had to be replaced.
However, It does almost sound like highly compressed air leaking out or something which is what I'd guess it is since you can't feel it or recreate it.
Either way, take it to the dealer and keep us posted.
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