When I first got the car, coming to a stop, I heard a lower pitched hum that wasn't the normal high pitched squeal. I was concerned that something was wrong with my rotors and I was going to be hit with a massive repair bill. I inspected everything and it all looked good, so I nervously drove on. A couple days later a 911 gt3 with PCCBs pulled to a stop next to me and made the exact same sound. I've never been so happy to hear that dreadful noise.
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