Rather loud brakes

The Dachshund · 09-29-2023, 08:29 PM

Hi all,

My brakes squeal rather badly and have done since I bought the car.

This is apparently normal. The manual describes it rather coyly as "functional noise".

Being new to relatively high performance vehicles I'm not sure if I should be proud of the noise or legitimately annoyed.

So is this normal? If not, is there anything that can be done about it?

Thanks.

Car is a 2021 M2 Competition

nismosao · 09-30-2023, 07:26 AM

Very normal. Brake harder more often and it will go away. It will also come back. Part of having race brakes (sort of).

David1 · 09-30-2023, 08:48 AM

Totally normal. I just wish mine squealed more consistently 😁

MooMooM2 · 09-30-2023, 10:53 AM

its strange I never had much squealing with the oem pads. Now on track pads and now it sounds like a I am a bus stopping at a bust stop lol but before was pretty quite.

The Dachshund · 09-30-2023, 03:53 PM

Thanks all - good to know!

Quote:

Originally Posted by nismosao

Very normal. Brake harder more often and it will go away. It will also come back. Part of having race brakes (sort of).

Yes, in fact the manual actually says that. It recommends you brake hard (when safe to do so

)

I'd be curious to know the physics behind it.

SEAT TIME RULES · 09-30-2023, 04:59 PM

Quote:

Originally Posted by The Dachshund

Thanks all - good to know!

Yes, in fact the manual actually says that. It recommends you brake hard (when safe to do so

)

I'd be curious to know the physics behind it.

In most cases the rear rotors over moderate braking the pads transfer material onto the rotors. Coming to a stop the squeal will be apparent.

Fastest way to eliminate it is the do a few hard stops, or left foot brake with your right on the gas pedal. Do that 3x's letting the surfaces cool for 30 seconds or so between each action. It has always worked for me if I'm in the mood to get rid of the noise. I kind of like it...

The Dachshund · 09-30-2023, 05:05 PM

Very interesting! Thank you.

Why the rear rotors in particular?

F87source · 09-30-2023, 05:48 PM

It could also be the pads against the guides, and if that's the case you'll need to apply abit of anti-squeal.

ZCPMV8 · 09-30-2023, 06:58 PM

Mine squeal when coming to a gentle stop, probably more often than not. I'd rather not hear it, but it doesn't really bother me too much.

I've read here that carbotech street pads almost completely eliminate the noise, but you'll be sacrificing brake power.

SchnellerM2C · 10-01-2023, 08:17 AM

I found the stock brakes to be sensitive & "grabby" at slow speeds and
they threw a lot of brake dust & squealed quite a bit.

I installed a set of HWAK Ceramic brake pads front & rear Part #'s: (Front - HB828Z.760 Rear - HB193Z.670)

All of the issues mentioned above were resolved.
The only caveat is that on the rear pads there is no provision for the wear sensor, which for me wasn't a big deal as I just tied it off to the side.

Good luck!

dls-m2c · 10-02-2023, 10:36 AM

Just go buy one of these....

https://fastlanegraphixs.com/product...acecar-sticker

Maynard · 10-02-2023, 10:46 AM

Bed them in properly - for street pads you probably don't need as many repetitions, but most people don't really work them hard enough - get at or close to ABS and then flooring it to keep interval short. It won't eliminate noise, but keeps it to a minimum.

or if all else fails, do a site search and you can see the multiple other posts on this same topic, complete w/ other pad suggestions, etc.

The Dachshund · 10-02-2023, 07:05 PM

Quote:

Originally Posted by dls-m2c

Just go buy one of these....

https://fastlanegraphixs.com/product...acecar-sticker

The Dachshund · 10-02-2023, 07:07 PM

Thanks all for further suggestions and advice - and for an excuse to drive harder.

chris719 · 10-04-2023, 08:54 PM

Quote:

Originally Posted by The Dachshund

Thanks all for further suggestions and advice - and for an excuse to drive harder.

Also, try washing your wheels and using a good wheel cleaner with iron remover. My brakes are mostly quiet for a couple days after a wash it seems.

OG Shark · 10-05-2023, 11:16 AM

The Dachshund - few ceramic pads out there you might look into - typically less squeal and dust. Also this stuff usually works well too -

BG Stop Squeal

Used it along with some ceramic pads on my wife's F85 X5M which sounded like a freight train stopping from day one. Worked extremely well and have used it on customer cars that have complained about squeal with good results as well.

09-29-2023, 08:29 PM	#1
The Dachshund New Member 2 Rep 11 Posts Drives: 2021 M2 Competition Join Date: Sep 2023 Location: California iTrader: (0)	Rather loud brakes Hi all, My brakes squeal rather badly and have done since I bought the car. This is apparently normal. The manual describes it rather coyly as "functional noise". Being new to relatively high performance vehicles I'm not sure if I should be proud of the noise or legitimately annoyed. So is this normal? If not, is there anything that can be done about it? Thanks. Car is a 2021 M2 Competition
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09-30-2023, 07:26 AM	#2
nismosao Private First Class 200 Rep 163 Posts Drives: '13 Toyota Tacoma, '21 M2C Join Date: Mar 2021 Location: Slidell, LA iTrader: (0)	Very normal. Brake harder more often and it will go away. It will also come back. Part of having race brakes (sort of).
	Appreciate 3 The Dachshund1.50 pdx2er63.00 MmmmmM22588.50 Quote

09-30-2023, 08:48 AM	#3
David1 Brigadier General 814 Rep 3,953 Posts Drives: 09 E92 09 X5 Join Date: Mar 2007 Location: Columbus, OH iTrader: (1)	Totally normal. I just wish mine squealed more consistently 😁 __________________ 2021 M2 Comp Sunset Orange \|Black with orange Stitching Dakota Leather\|Executive Pkg\|DCT
	Appreciate 2 The Dachshund1.50 Moflow2484.50 Quote

09-30-2023, 10:53 AM	#4
MooMooM2 Lieutenant Colonel 1819 Rep 1,610 Posts Drives: M2 Comp Join Date: Apr 2021 Location: NY iTrader: (2)	its strange I never had much squealing with the oem pads. Now on track pads and now it sounds like a I am a bus stopping at a bust stop lol but before was pretty quite.
	Appreciate 1 The Dachshund1.50 Quote

09-30-2023, 05:05 PM	#7
The Dachshund New Member 2 Rep 11 Posts Drives: 2021 M2 Competition Join Date: Sep 2023 Location: California iTrader: (0)	Very interesting! Thank you. Why the rear rotors in particular?
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09-30-2023, 05:48 PM	#8
F87source Major General 7252 Rep 7,429 Posts Drives: Bmw M2 Join Date: Aug 2018 Location: . iTrader: (1)	It could also be the pads against the guides, and if that's the case you'll need to apply abit of anti-squeal. __________________ Click on the link below to see a compiled list of every review I have ever written: https://f87.bimmerpost.com/forums/sh...2#post30368242
	Appreciate 1 The Dachshund1.50 Quote

09-30-2023, 06:58 PM	#9
ZCPMV8 Private 35 Rep 64 Posts Drives: BMW M3 Join Date: Jun 2023 Location: DC iTrader: (0)	Mine squeal when coming to a gentle stop, probably more often than not. I'd rather not hear it, but it doesn't really bother me too much. I've read here that carbotech street pads almost completely eliminate the noise, but you'll be sacrificing brake power.
	Appreciate 2 The Dachshund1.50 Moflow2484.50 Quote

10-01-2023, 08:17 AM	#10
SchnellerM2C Private 122 Rep 60 Posts Drives: M2c, s54E30, Z3MCoupe, Join Date: Feb 2022 Location: West Newbury, MA iTrader: (1)	I found the stock brakes to be sensitive & "grabby" at slow speeds and they threw a lot of brake dust & squealed quite a bit. I installed a set of HWAK Ceramic brake pads front & rear Part #'s: (Front - HB828Z.760 Rear - HB193Z.670) All of the issues mentioned above were resolved. The only caveat is that on the rear pads there is no provision for the wear sensor, which for me wasn't a big deal as I just tied it off to the side. Good luck!
	Appreciate 1 chris7197334.00 Quote

10-02-2023, 10:36 AM	#11
dls-m2c Enlisted Member 33 Rep 33 Posts Drives: 2021 BMW M2C LBB, 2023 X3M Red Join Date: Nov 2020 Location: Pennsylvania, USA iTrader: (0)	Just go buy one of these.... https://fastlanegraphixs.com/product...acecar-sticker
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10-02-2023, 10:46 AM	#12
Maynard Colonel 3848 Rep 2,873 Posts Drives: 228iX & M2C Join Date: Mar 2016 Location: Upstate NY iTrader: (1)	Bed them in properly - for street pads you probably don't need as many repetitions, but most people don't really work them hard enough - get at or close to ABS and then flooring it to keep interval short. It won't eliminate noise, but keeps it to a minimum. or if all else fails, do a site search and you can see the multiple other posts on this same topic, complete w/ other pad suggestions, etc.
	Appreciate 1 The Dachshund1.50 Quote

10-02-2023, 07:07 PM	#14
The Dachshund New Member 2 Rep 11 Posts Drives: 2021 M2 Competition Join Date: Sep 2023 Location: California iTrader: (0)	Thanks all for further suggestions and advice - and for an excuse to drive harder.
	Appreciate 1 Fred Conoway365.00 Quote

10-05-2023, 11:16 AM	#16
OG Shark BimmerPost Supporting Vendor 4693 Rep 2,542 Posts Drives: Angry Join Date: Oct 2014 Location: Spring Branch, TX iTrader: (5)	The Dachshund - few ceramic pads out there you might look into - typically less squeal and dust. Also this stuff usually works well too - BG Stop Squeal Used it along with some ceramic pads on my wife's F85 X5M which sounded like a freight train stopping from day one. Worked extremely well and have used it on customer cars that have complained about squeal with good results as well.
	Appreciate 0 Quote