Have you had your brake fluid changed recently? Kind of sounds like your brake solenoid working overtime. Just a guess, it's kind of hard to tell from the bid.
2011 Le Mans Blue M3// Black extended Novillo w/ Blue Grey Aluminum trim/DCT/ZTP/ZCW/ZPP/ZCP Premium Sound ///Akrapovic Evolution Exhaust
2012 Le Mans Blue 135i M Pkg DCT
2013 Ford F150 FX4 Supercrew