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Could be one of a few things.
Rock stuck between heat shield and brake rotor (push heat shield back away from rotor a little bit to free it)
If it's a brand new 2018 and the dealership washed it, could be some surface rust on the rotor(s) grinding against the pads. Brake a few times and that should clear it up.
Could also be parking brake rubbing inside the rear hat, if it doesn't go away soon I'd take back to the dealer and ask them to check adjustment on the parking brake.
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2004 Matrix XRS 6MT => 2008 VW R32 DSG => 2012 Audi TTRS 6MT => 2018 BMW ///M2 6MT
I'm an IT guy by trade and tech nerd by choice. 
I like HPDEs, parts of US Hwy 129, NC 28, and the Cherohala Skyway.
I'm also a fan of aural pleasure.  |