02-16-2024, 10:16 PM | #1 |
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New pads and rotors -- "whirling" sound when braking?
I had new OE rear pads and rotors installed on my 2016 F83. Indy shop did an outstanding job and cleaned everything thoroughly including the calipers. Anyway the car now makes this weird “whirling” sound when depressing the brake pedal. It’s not a squeal or anything like that. And the stopping power is great. (I replaced the lines with stainless steel lines from ECS.)
I have read that this sound is normal with new pads and rotors and goes away after a while, but I want to ask you fine folks. Thanks.
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2016 BMW F83 ///M4 Tanzanite Blue Metallic/Silverstone Full Merino // NBTevo ID 6 retrofit // G3x/F90 10.25" MGU display retrofit // GTS flash // SmartTOP // 437M + Pilot Alpin PA4 (winter) // 359M + ContiSportContact 5P (summer)
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02-17-2024, 08:40 AM | #2 |
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Cross drilled rotors can make a whirling sound but I’m surprised you hear it with only a rear brake service. Do you hear the noise with the windows up? It should get quieter with more mileage/bedding in.
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02-17-2024, 09:20 AM | #3 | |
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https://youtu.be/a_MfJElYmlg?si=y6-3G704RD-f88vu
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02-17-2024, 11:02 AM | #4 |
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Update: This morning I drove the car on the expressway at higher speeds and then on side roads at lower speeds, for probably a total of 50 miles. At first the turbine sound was present as before when braking. But after a while, it disappeared completely. Maybe it was just a break-in/bedding issue?
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2016 BMW F83 ///M4 Tanzanite Blue Metallic/Silverstone Full Merino // NBTevo ID 6 retrofit // G3x/F90 10.25" MGU display retrofit // GTS flash // SmartTOP // 437M + Pilot Alpin PA4 (winter) // 359M + ContiSportContact 5P (summer)
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02-17-2024, 12:24 PM | #5 | |
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02-22-2024, 10:08 AM | #6 |
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It has now been about 250 miles since the new rotors and pads where installed. The sound is much less noticeable now but is still there, especially when slowing to a complete stop. Also, with reference to the picture, the wear pattern is not circular, like my front or old rear rotors. Is that normal or indicative of an installation error? Thanks.
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02-22-2024, 10:26 AM | #7 | |||
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The repeating cross-hatched marks on the rotor surface are machining marks leftover from the manufacturing process. They’ll be there for a while especially on rear rotors. This is normal and will wear away with mileage. |
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02-28-2024, 10:33 AM | #8 | |
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This guy is slowing down after being on the track (though his brakes appear to be new). My car makes this sound when applying the brakes at street speeds. Is that normal? Sorry for the repeated questions, I just want to make sure that there is not anything wrong.
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02-28-2024, 11:41 AM | #9 | |
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02-29-2024, 11:14 AM | #10 | |
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02-29-2024, 11:37 AM | #11 | |
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02-29-2024, 01:01 PM | #12 |
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Thank you very much -- I appreciate your insight on this!
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02-29-2024, 01:31 PM | #13 |
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You’re welcome
Try rebedding the pads if the rotor surface(s) still looks shiny and still has machining marks. Rotors should look like this when fully bedded with a uniform layer of brake pad material: |
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03-06-2024, 08:00 AM | #14 | |
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03-06-2024, 09:08 AM | #15 |
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The rotor surface looks like it’s showing a nice uniform pad transfer layer. However, the presence of the machine marks still showing on the rotor surface suggests they still aren’t fully bed-in even with 600 miles. Have you done any of the bed-in techniques? Are they still making the whirling sound?
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03-07-2024, 06:31 AM | #16 | |
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And yes, the whirring sound is still present, especially when braking (and even decelerating without braking!) at low speeds, approaching a complete stop. I took it to the dealer and had the shop foreman drive the car around. The foreman said the sound I'm hearing now is most likely something with my winter tires, probably an uneven wear issue, and suggested that I wait until I swap to my summer tires and see if the sound ceases at that point. Considering that I hear this sound when decelerating without braking at all and that the sound changes with the rotational speed of the wheels, his theory seems plausible to me. The winter tires (Michelin Pilot Alpin PA4) have plenty of tread on them with no observable problems, but the fronts (where the sound is most noticeable) are a bit dated now, with 2018 and 2019 date codes. Maybe the tires are starting to harden (or something) which is causing this sound...? Thoughts? Thanks!
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03-07-2024, 11:06 AM | #17 | |
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Like I said, your rotors now appear to have a uniform transfer layer of pad material but there’s still a small amount of manufacturing marks still visible. The marks are not a concern but completing one full bedding-in procedure should eliminate them. However, it’s definitely safe to fully use your brakes now and I’d recommend doing at least five 60 mph to 20 mph repeated stops in quick succession. Then drive for 15-20 min without using the brakes (e.g., drive on the highway). This will finish the bedding-in of your brakes. Don’t worry about having to heavily apply your brakes at this point because you have a sufficient pad transfer layer so the rotor surface is protected. |
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03-07-2024, 11:15 AM | #18 | |
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03-07-2024, 11:29 AM | #19 | |
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03-09-2024, 05:09 PM | #20 |
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Thanks for this. I will post updates in this thread and after I switch to my summer tires.
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03-09-2024, 05:25 PM | #21 | |
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I always look forward to the switch back to summer performance tires! However, we keep an e92 M3 on summer performance tires so on a decent winter day with no salt on the roads, we can take it out for a fun few hour drive. |
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03-11-2024, 06:14 PM | #22 | |
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