[m2compred5]

[QUOTE=Ratcher;28485950]Firstly, stop complaining about brake noise when you're driving an M car. Performance brakes are noisy, if you need a comfy car for your daily routine, buy an M240i or something similar.

Or should we go back to the days of the E9x generation, where brakes were absolute tihs?

Also, and this is no joke, I notice that my brakes start squealing if I don't push them very hard for a longer period of time. Everytime I track the car it gets quiet for a couple of months.[/QUOTE

My c7 corvettes grandsport brakes are a bit better then the M2 comp and that car is silent. Those are Brembo s

[agent_orange]

I noticed when changing the pads in mine, that the stock 2NH pads have no chamfer/taper on the friction material whatsoever.
Virtually all aftermarket pads and in fact all other OEM pads I've ever seen in 20+ years of messing around with cars have some (or a lot of) chamfer.
Reducing the noise could potentially be as simple as grinding the leading and trailing edges of the front pad friction material to add a modest taper.

[Davil]

I like the occasional G rated squeal I get. Not very frequent though.

Try race pads and sounding like a garbage truck as you come to a set of lights.

[wjones14]

Originally Posted by Ratcher

Firstly, stop complaining about brake noise when you're driving an M car. Performance brakes are noisy, if you need a comfy car for your daily routine, buy an M240i or something similar.

Do you have a theory as to why the similar Brembo brakes on the Chevy Camaro SS 1LE and Corvette are silent? Do you not consider them performance brakes?

I owned a 1LE prior to the M2C and the brakes never made a squeak. According to Road & Track's head-to-head comparison, the Camaro brakes stop quicker too.

[Ratcher]

Originally Posted by wjones14

Do you have a theory as to why the similar Brembo brakes on the Chevy Camaro SS 1LE and Corvette are silent? Do you not consider them performance brakes?

I owned a 1LE prior to the M2C and the brakes never made a squeak. According to Road & Track's head-to-head comparison, the Camaro brakes stop quicker too.

What of a theory? The brakes don't need to be noisy in every situation, but they CAN be and still be perfectly fine. Depends on so many things, that it doesn't even make sense to start listing them.

Do all CCB make noise? No... but most do.

Do all steel brakes make noise? No... but the sportier the setup, the noiser they CAN be.

I thought it was ridiculous that Porsche had to make an extra page on their website mentioning why brake squeal is normal, but I understand why.

I'll share it yet again

[wjones14]

Originally Posted by Ratcher

What of a theory? The brakes don't need to be noisy in every situation, but they CAN be and still be perfectly fine. Depends on so many things, that it doesn't even make sense to start listing them.

Do all CCB make noise? No... but most do.

Do all steel brakes make noise? No... but the sportier the setup, the noiser they CAN be.

I thought it was ridiculous that Porsche had to make an extra page on their website mentioning why brake squeal is normal, but I understand why.

Sorry, didn't mean any offense by my question. From your original answer that performance brakes make noise and we should just deal with it, I figured you knew a lot more about the subject than me. So I figured I'd ask. I'll take your original statement to really mean that SOME performance brakes make noise.

Porsche and BMW admit their brakes make noise. Brembo brakes on the Chevy performance cars don't make noise. Guess we'll never know why. Should have stuck with my Camaro... ...j/k.

[Maynard]

Originally Posted by wjones14

Do you have a theory as to why the similar Brembo brakes on the Chevy Camaro SS 1LE and Corvette are silent? Do you not consider them performance brakes?

I owned a 1LE prior to the M2C and the brakes never made a squeak. According to Road & Track's head-to-head comparison, the Camaro brakes stop quicker too.

some misunderstanding about brakes in this:

Braking distance is purely a function of tire grip and car weight (provided the brakes can activate ABS, which both can).

The 'performance' aspects of track brakes are related to how they work when repeatedly used very hot. The noise is partly a by product of the metallic compounds needed for this, but LOTS of other factors (some interesting tech papers on this, and that Porsche page). So it is mostly about pad composition, and I suspect that Corvettes come with quieter and more street-friendly factory pads. Anyone tracking them will swap to track pads (either before they go, or after the first 15 minutes when the factory pads melt to goo). If you hate the noise, you can find aftermarket pads that will be quieter.

I find that complaints about this noise are sporadic, not everyone has noisy brakes (mine haven't been as noisy as the OG M2 setup I have on the 228), so I suspect it is a factor of bedding or how the car is driven.

[Ratcher]

Originally Posted by wjones14

Sorry, didn't mean any offense by my question. From your original answer that performance brakes make noise and we should just deal with it, I figured you knew a lot more about the subject than me. So I figured I'd ask. I'll take your original statement to really mean that SOME performance brakes make noise.

Porsche and BMW admit their brakes make noise. Brembo brakes on the Chevy performance cars don't make noise. Guess we'll never know why. Should have stuck with my Camaro... ...j/k.

No offense taken man, this is a forum meant for people to share their opinions...
It's just that the topic of brakes heats up my blood for some reason I've had so many headaches with them, maybe it's that

[wjones14]

Originally Posted by Maynard

So it is mostly about pad composition, and I suspect that Corvettes come with quieter and more street-friendly factory pads. Anyone tracking them will swap to track pads (either before they go, or after the first 15 minutes when the factory pads melt to goo). If you hate the noise, you can find aftermarket pads that will be quieter.

I find that complaints about this noise are sporadic, not everyone has noisy brakes (mine haven't been as noisy as the OG M2 setup I have on the 228), so I suspect it is a factor of bedding or how the car is driven.

I think these two things may be the answer - pad composition and driving habits.

I did take my Camaro to 3 different tracks. Watkins Glen was fairly high speed where I had to brake hard from about 140 mph on the back straight at the "bus stop." I did four 25-minute sessions there in hot weather and never had an issue with the stock 1LE pads. However, I do agree with you that many folks do change out the pads for track use. I am just a casual once-per-year track guy running in the Intermediate run group, so the stock 1LE was good enough for me.

And I just recently got past the break-in mileage with the M2C so haven't had a chance to track it yet. I will admit to not really driving this car hard at all on the public roads - not because I don't want to, but because I live in a populated suburban area where it just wouldn't be cool. So the brake noise problem could very well be my own fault for not driving hard enough.

[wjones14]

Update: I created a post about brake squeal in the Facebook group "BMW M2, M2 Competition & M2 CS Owners Group" that received over 100 replies in less than a day.

The replies were all over the place, like on this forum. Many replies like "It's an M car, live with it" but also several constructive suggestions. One that caught my attention was a guy who said his squealing was loud enough to hear from a block away. He brought it to the dealer, they kept it a week, and finally gave it back telling him it was normal. He ended up pulling the wheels off himself, using compressed air to clear grit, etc. from the brake parts, and temporarily at least, his problem was fixed. He guessed there was possibly grit behind the anti-rattle clip that holds the pads in.

It's sub-freezing here in CT now with a Nor'easter incoming, but when it warms up a bit, I may pull the wheels and use compressed air and brake cleaner spray on the brake parts.

Anyway, going back to the BMW's official suggestions in the owner's manual and on their M braking web page, I decided to do another series of hard stops yesterday afternoon. On the way to the gym, I went down a low-traffic road with no houses and did 5 hard stops from 50 mph. Didn't hear any squeals on the ride to the gym and back after that.

If doing frequent hard stops is the solution, how often do we need to do it?

[Bumpinjeep]

Originally Posted by wjones14

Update: I created a post about brake squeal in the Facebook group "BMW M2, M2 Competition & M2 CS Owners Group" that received over 100 replies in less than a day.

I saw that and wondered if you were the same person. I replied with the Porsche video there too lol.

[(K)]

I think more owners are now starting to accept that a little heat from hard breaking will reduce the squeal down to nothing. In terms of how often, I guess that depends on your driving conditions/frequency. The best way to tell is probably just to listen for it, I suppose.

[wjones14]

Originally Posted by (K)

I think more owners are now starting to accept that a little heat from hard breaking will reduce the squeal down to nothing. In terms of how often, I guess that depends on your driving conditions/frequency. The best way to tell is probably just to listen for it, I suppose.

After I posted the question about how often to do it, I thought, duh - whenever the brake squeal returns!

With that incoming nor'easter I spoke about and possible 2 feet or more of snow tomorrow, I went out at lunch today to run a final errand before hunkering down for a few days. I went back down the low traffic road to do several more hard stops, and then drove normally for a while including going into a residential area with a lot of stop signs. Never heard a peep. I kept waiting for it after hearing a squeal at every stop for several months but was pleasantly surprised. There's a ton of brake dust on the wheels now, but at least they're quiet for the moment.

[(K)]

One of the "quirks" of the car I've come to accept. Loud, dusty, beautiful brakes. And a gas tank the size of a thimble.

We're expecting 2 feet of snow in my neck of the woods but the car has been garaged since the beginning of December. It's also stored 30 minutes away from me as to curb any attempt to take it out.

Stay warm out there!

[Steelguin]

was 91 here yesterday

[scarygary]

whenever mine squeal, i just grit my teeth and stop more abruptly when i can haha

[SEAT TIME RULES]

Originally Posted by wjones14

After I posted the question about how often to do it, I thought, duh - whenever the brake squeal returns!

With that incoming nor'easter I spoke about and possible 2 feet or more of snow tomorrow, I went out at lunch today to run a final errand before hunkering down for a few days. I went back down the low traffic road to do several more hard stops, and then drove normally for a while including going into a residential area with a lot of stop signs. Never heard a peep. I kept waiting for it after hearing a squeal at every stop for several months but was pleasantly surprised. There's a ton of brake dust on the wheels now, but at least they're quiet for the moment.

Yup thats all you have to do every once and a while... is a couple of hard stops. I actually LFB while on the gas. That takes off any pad residue on the rear rotors quickly.

[MrMnM]

Interesting, just got my M2 and was wondering why I have so much squealing as I drive around town Â…. I guess this is one to live with.

Does anyone have any experience with using other types of break pads

[MrMnM]

Interesting, just got my M2 and was wondering why I have so much squealing as I drive around town …. I guess this is one to live with.

Does anyone have any experience with using other types of break pads

[aftercorbu]

Originally Posted by m2compred5

Hm, I do notice it seems intermittent.
I will try to drive more aggressively.
See if it warms up the pads

There you go! That's the spirit. Plus they will call for attention when it's cold outside. 😉 Helps take your mind off the prodigious amounts of dust they cast onto your wheels.

[M2Cmtl]

Bigger rotors will be louder. Think drum cymbals. More mass more volume.

[Tag]

This issue has been around since the first F80/2's came out with the smaller blue caliper brakes and it continues with the 2NH on the M2c. I've also experienced this same issue on non-M cars optioned with the sport brakes which have the same blue calipers that M cars do, but the rotors on them are not drilled. It has to do with the design of the pads and/or the calipers, not the rotors.

They make noise mostly when it's cold out, but can also do so when it's warm. Haven't seen any way to get rid of the noise other than hard acceleration and stops which only mitigates the issue for a few minutes before it rears its ugly head again. I've seen people resolve this by getting entirely new brake kits, but not sure if a more economical option like pads would also work.