I own a 2004 S430 and i am experiencing a terrible squealing everytime I brake. This has been happening since i first purchased the car. Since then I have had the brake rotors replaced and i have had to replace the brake pads twice this year. However, the squealing still continues and is progressively sounding worse and deeper. I powerwash and clean my brakes every week to prevent a build up of dust, because i live in nevada. I am not sure if this brake squeal is normal. Does anyone have any suggestions of answers to my problem??