Check the rear rotors and see if you have any white or blue spots on the rotor. What happened to me once was I had my 36K service done, they did my brake fluid and adjusted my parking brake, it was adjusted incorrectly and it was dragging causing a vibration and then eventually creating blue and white spots on the rotor.
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N1rve
2019 BMW ///M4 - Alpine White | Sakhir Orange/Black Leather | M-DCT | Executive Package | 19" Black 437M Wheels | Carbon Fiber Trim | Sunroof | Active Blind Spot | Heated Steering Wheel | Adaptive M Suspension
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