My car is brand new brought it at 9miles on dash. exactly 2 months later outta nowhere there was this grinding sound when i would brake like the sound of rooters grinding as if brakes where bad ,,4 other people heard and witnessed it,, i pumped brake it felt like and sound like only air but loud air and grinding, took it back to dealer next day ,,and they did nothing (marlow heights) he told me to come back monday cause it found like faulty brake issue,, i looked it up and some models where recalled for same thing.associate told me they do service on recalls mon-fri,(which i thought was strange cause brakes are serious nobody could check nothing?)), came back monday they put my car on electronic machine no flags where on my system,,for sensors going off! but i had no break function on that saturday,,this need to be looked into by gm.