Hi have same squealing noise not sure which brake it is. But it happens when my Silverado is turned off and parked. when I take off after some time it squeals and a loud sound of dragging or rubbing it’s leasts for a few minutes after I take off even if I’m not pressing on the brakes I took it to a dealer because I got a recall for something and ever since I got it back it’s gotten worse not sure what it is I will be contacting the dealer tomorrow and have it looked at.