1,300 miles on my CX-30. I've been to the dealer three times for this, engaged Mazda corporate and have been told it's "Normal". Since I took delivery (130 miles on it because it had to be delivered from Northern Virginia to Virginia Beach), the brakes make a droning sound when gradually slowing from around 50 mph to around 30 mph. It only occurs when the brake pedal is depressed. It's clearly related to pads or rotors and I think it's coming from the rear end, passenger side. Dealer worked with Mazda technicians and say they've replaced the pads and rotors.....and now the dealer and Mazda say it's "Normal". It's not normal when passengers rountinely ask me "what the hell is that?" when I brake to slow down. I'll try to get a recording of it and post it here. Has anyone noticed irregular droning types of sounds while slowing? It shouldn't be rocket science for Mazda to fix this. There are only so many parts that can cause it. Very irritating on a 35K car! I can get over the cheap gauge cluster plastic that is already spiderwebbed (from delivery) and the sound of the driver's side door when closed (sounds cheap), but this one pisses me off. I'm half tempted to just replace all the pads and rotors myself as a last resort. Ideas/thoughts?