Strange brake noise and the brakes are not stopping properly?

2023 BMW M5
500 MILES • AUTOMATIC
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JACQUELINEMEERA
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Hello. I am Jacqeline Meera, and I bought the vehicle listed above a week ago. Everything seems to be fine until the 2nd week. The car is making a strange GRRRRRR sound when I brake. I went for a checkup, and it seems that they didn't find anything wrong. Now the GRRRRRR sound is louder, and my car is barely stopping. I had to keep pumping the brake pedal then it eventually stopped. Can you help me please?
Dec 20, 2023 at 4:41 PM
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ROOKIE_WRENCHER
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Hello, if you look at your brake rotors, do you notice any scoring on them? Like deep scratches or lines?
Dec 20, 2023 at 9:56 PM
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JACQUELINEMEERA
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I got a replied email but there are no replies here
Dec 20, 2023 at 10:14 PM
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STRAILER
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Hello Jacqeline,

To me it sounds like the ABS system is kicking in. Can I ask if the ABS light is on at any time? Also, does the noise correspond with a feeling at the brake pedal? You could have a defective ABS wheel speed sensor that is making the ABS kick on. Can you please shoot a quick video with your phone so I can hear the noise? That way I can tell for sure what's going on. You can upload it here with your response.

Dec 21, 2023 at 5:14 PM