Brake squeal! [Solved]

teaston · 11-24-2014, 01:30 PM

Since fitting my 400M winter wheels I've had brake squeal, when coming to a stop or slowing to a near stop they squeal for the last couple of seconds. I had no squeal at all with my 403M's!

I know quite a few people have complained about this in the past, but it seems to not be around so much since the M Sport plus pack came out, which further suggests that it's because of the 400M's.

Has anyone else noticed this since putting your winter wheels on?

Rich9600 · 11-24-2014, 01:51 PM

I can't say I've noticed anything since the change over. 18" 441M's.

evan15281 · 11-24-2014, 03:01 PM

I've not had this and I think we're running same set up for summers and winters

teaston · 11-24-2014, 03:02 PM

How many miles have your cars done?

Rich9600 · 11-24-2014, 03:08 PM

8500 miles on summers, 400 miles so far on winters.

Squeal is surely friction induced vibrations. Could it be something simple like some grit knocked under pad or possible different wheel bolt tensions leading to a slightly different alignment of the rotor?

evan15281 · 11-24-2014, 03:11 PM

Quote:

Originally Posted by teaston

How many miles have your cars done?

11000 on mine

teaston · 11-24-2014, 03:12 PM

Quote:

Originally Posted by Rich9600

8500 miles on summers, 400 miles so far on winters.

Squeal is surely friction induced vibrations. Could it be something simple like some grit knocked under pad or possible different wheel bolt tensions leading to a slightly different alignment of the rotor?

Could be worth trying different torques. I've done them to the recommended 120nm, but the summer wheels were done really tight from the factory, I had to get the breaker bar out for some of the bolts!

Rich9600 · 11-24-2014, 03:18 PM

Quote:

Originally Posted by teaston

Quote:

Originally Posted by Rich9600

8500 miles on summers, 400 miles so far on winters.

Squeal is surely friction induced vibrations. Could it be something simple like some grit knocked under pad or possible different wheel bolt tensions leading to a slightly different alignment of the rotor?

Could be worth trying different torques. I've done them to the recommended 120nm, but the summer wheels were done really tight from the factory, I had to get the breaker bar out for some of the bolts!

BMW recommended 120Nm but the form said 140Nm...

I needed I 2' breaker bar and my weight to undo my wheel bolts. However, 140Nm was easy to apply with a 2' torque wrench.

Highlandpete and Brigand recommended the 5 point star torquing technique at 140Nm.

Basically, number the bolts 1-5 clockwise and tighten them 1,3,5,2,4. Evenly torques up the wheel.

SkyJawa · 11-24-2014, 03:31 PM

Ok so far here too....

evan15281 · 11-24-2014, 03:35 PM

I've also gone for 140nm

MarkG_M5Comp · 11-24-2014, 04:09 PM

My brakes started squealing again over the last couple of days - I think it's the weather. Planning a couple of heavy braking sessions tomorrow, that stops it every time.

JD6 · 11-24-2014, 04:17 PM

No problem here after 9000 miles on 403Ms since May and 1000 on 400Ms over the last 2-3 weeks.

teaston · 11-24-2014, 04:52 PM

Just went out and torqued them all up to 140nm, see how that goes tomorrow.

SomeRandomer123 · 11-24-2014, 08:34 PM

Just stand on the bastards, that'll sort it

teaston · 11-25-2014, 03:38 AM

Quote:

Originally Posted by SomeRandomer123

Just stand on the bastards, that'll sort it

That what I'll try on a quiet country lane if the torque hasn't made a difference!

teaston · 11-25-2014, 05:20 AM

Well the increased bolt torque seems to have fixed the problem!

Thanks @Rich9600

Carjack · 11-25-2014, 06:26 AM

A couple of years ago on my F30 I used to have 'brake squeal'.
It was a brake disc steel weather shield which had worked loose and was rubbing on the disc.
Only seemed to happen at low speeds when braking.

Rich9600 · 11-25-2014, 09:58 AM

Quote:

Originally Posted by teaston

Well the increased bolt torque seems to have fixed the problem!

Thanks @Rich9600

Glad my guess seems to have helped.

I wonder how many BMW technician man hours have been spent on this?...

teaston · 11-25-2014, 10:15 AM

Quote:

Originally Posted by Rich9600

Quote:

Originally Posted by teaston

Well the increased bolt torque seems to have fixed the problem!

Thanks @Rich9600

Glad my guess seems to have helped.

I wonder how many BMW technician man hours have been spent on this?...

Not just helped, completely fixed it!

Yep bet they would try all sorts and still not fix it!

....,,,,..,,.. · 11-25-2014, 12:04 PM

Quote:

Originally Posted by teaston

Not just helped, completely fixed it!

Yep bet they would try all sorts and still not fix it!

Pretty much first thing to do with squeaky brakes (other than cheese) is, wheels off both sides, clean, airline etc give it a good check over, checking brakes and then wheels back on re torquing to correct levels.

Then road test.

Can't imagine it has changed since Adam was a lad.

One big issue of people not putting wheels on correctly, as in tightening up incorrectly is warped disks, noisy brakes etc.

I have seen mates just tightening them up as if a clock face.

teaston · 11-25-2014, 12:12 PM

Quote:

Originally Posted by Brigand

Pretty much first thing to do with squeaky brakes (other than cheese) is, wheels off both sides, clean, airline etc give it a good check over, checking brakes and then wheels back on re torquing to correct levels.

Then road test.

Can't imagine it has changed since Adam was a lad.

One big issue of people not putting wheels on correctly, as in tightening up incorrectly is warped disks, noisy brakes etc.

I have seen mates just tightening them up as if a clock face.

BMW do recommend 120nm though!

....,,,,..,,.. · 11-25-2014, 12:17 PM

Quote:

Originally Posted by teaston

BMW do recommend 120nm though!

Yes 120nm for the M12 as used on E9x etc.

For F3x they use M14 and that's 140nm

11-24-2014, 01:30 PM	#1
teaston Banned 10995 Rep 32,881 Posts Drives: X3 M40d Join Date: May 2012 Location: The High Seas iTrader: (1)	Brake squeal! [Solved] Since fitting my 400M winter wheels I've had brake squeal, when coming to a stop or slowing to a near stop they squeal for the last couple of seconds. I had no squeal at all with my 403M's! I know quite a few people have complained about this in the past, but it seems to not be around so much since the M Sport plus pack came out, which further suggests that it's because of the 400M's. Has anyone else noticed this since putting your winter wheels on? Last edited by teaston; 11-25-2014 at 05:24 AM..
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11-24-2014, 01:51 PM	#2
Rich9600 Colonel 741 Rep 2,511 Posts Drives: i4 M50 Join Date: Nov 2013 Location: UK iTrader: (0)	I can't say I've noticed anything since the change over. 18" 441M's. __________________ Driving i4 M50 (G26) Previous 340i Touring MSport (F31)
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11-24-2014, 03:01 PM	#3
evan15281 Lieutenant 86 Rep 459 Posts Drives: 335d Join Date: Mar 2014 Location: Lanarkshire iTrader: (0)	I've not had this and I think we're running same set up for summers and winters
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11-24-2014, 03:02 PM	#4
teaston Banned 10995 Rep 32,881 Posts Drives: X3 M40d Join Date: May 2012 Location: The High Seas iTrader: (1)	How many miles have your cars done?
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11-24-2014, 03:08 PM	#5
Rich9600 Colonel 741 Rep 2,511 Posts Drives: i4 M50 Join Date: Nov 2013 Location: UK iTrader: (0)	8500 miles on summers, 400 miles so far on winters. Squeal is surely friction induced vibrations. Could it be something simple like some grit knocked under pad or possible different wheel bolt tensions leading to a slightly different alignment of the rotor? __________________ Driving i4 M50 (G26) Previous 340i Touring MSport (F31)
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11-24-2014, 03:31 PM	#9
SkyJawa Major General 3719 Rep 8,636 Posts Drives: F10 530d Join Date: May 2014 Location: Hampshire iTrader: (1)	Ok so far here too....
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11-24-2014, 03:35 PM	#10
evan15281 Lieutenant 86 Rep 459 Posts Drives: 335d Join Date: Mar 2014 Location: Lanarkshire iTrader: (0)	I've also gone for 140nm
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11-24-2014, 04:09 PM	#11
MarkG_M5Comp Supreme Being 1804 Rep 5,425 Posts Drives: M5 Comp Join Date: Jul 2013 Location: Hampshire, UK iTrader: (0)	My brakes started squealing again over the last couple of days - I think it's the weather. Planning a couple of heavy braking sessions tomorrow, that stops it every time. __________________ Current: F90 M5 Competition Gone: F80 M3 Competition Pack / M135i / F15 X5 M50d / Saab 9-5 Aero HOT / F30 335d xDrive M Sport / E92 LCI 320d M Sport / E46 320d M Sport Touring / E46 318i Touring
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11-24-2014, 04:17 PM	#12
JD6 Major General 4271 Rep 6,945 Posts Drives: 840i GC + Mini Electric L3 Join Date: May 2014 Location: United Kingdom iTrader: (0)	No problem here after 9000 miles on 403Ms since May and 1000 on 400Ms over the last 2-3 weeks.
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11-24-2014, 04:52 PM	#13
teaston Banned 10995 Rep 32,881 Posts Drives: X3 M40d Join Date: May 2012 Location: The High Seas iTrader: (1)	Just went out and torqued them all up to 140nm, see how that goes tomorrow.
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11-24-2014, 08:34 PM	#14
SomeRandomer123 Colonel 307 Rep 2,612 Posts Drives: F30 328i Luxury - Sport Auto Join Date: May 2011 Location: Lancashire, North West England, UK iTrader: (0)	Just stand on the bastards, that'll sort it __________________ Gone: 2006 BMW E60 520d SE 6MT Gone: 2009 BMW E90-LCI 330d SE 6MT Current: 2012 F30 328i Luxury 8AT On Order: 2015 Audi A6 Avant Ultra, Black Edition (sorry!)
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11-25-2014, 05:20 AM	#16
teaston Banned 10995 Rep 32,881 Posts Drives: X3 M40d Join Date: May 2012 Location: The High Seas iTrader: (1)	Well the increased bolt torque seems to have fixed the problem! Thanks @Rich9600 Last edited by teaston; 11-25-2014 at 05:27 AM..
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11-25-2014, 06:26 AM	#17
Carjack Stormtrooper 170 Rep 806 Posts Drives: 330i G20 M-Sport Portimao Blue Join Date: Jul 2010 Location: London iTrader: (0)	A couple of years ago on my F30 I used to have 'brake squeal'. It was a brake disc steel weather shield which had worked loose and was rubbing on the disc. Only seemed to happen at low speeds when braking.
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