I've got a 2020 X3 M40i and the front brakes have started this embarrassing high pitched squeal whenever I'm coming to a slow stop, like in drive throughs or parking lots. The thing is I had the pads checked and they've got plenty of life left, maybe 70 percent. I tried bedding them in again on an empty road but the noise came back after a day. I'm wondering if it's just cheap pads that the previous owner put on or maybe the rotors have a glaze on them. I don't wanna just throw money at new rotors if a simple clean and lube of the guide pins might fix it. I've been looking for a place where Certified Brake Service Available isn't just a fancy phrase but actually means they'll diagnose the real cause instead of selling me a full set of rotors and pads. Does anyone know if the M40i brakes are known for this issue? Also I've heard some shops use a special paste on the back of the pads that helps with noise, is that actually effective or just a temporary fix? Really don't wanna be that guy in the parking lot that everyone turns to look at when I stop. Any advice from folks who've chased down brake squeal successfully would be awesome. Also curious if upgrading to different pad material would help or if I should just stick with OEM. Thanks.