Brembo BBK rubbing

swamp2 · 03-15-2012, 01:44 AM

Has anyone noticed any rubbing of their Brembo BBK?

When swapping out my tires I thought the shop scratched the inner barrels of my wheels. Both rear and one front wheel have some marks on the inner barrels that look like fine machining marks through the paint and into the metal (serious bummer...). After speaking to the guy who did the tires he noticed these marks before beginning the work. They are lined up well with the hex mounting bolts that attach the caliper to the mounting bracket. The clearance between the bolt head and the inner diameter of my rear wheels is very small, probably 1 mm or less (0.04" or less). The clearance on the fronts is maybe double that but I don't recall exactly. Either way it is larger. Perhaps a big pothole or other road irregularity, perhaps combined with low tire pressure caused just enough distortion in the wheel assembly to make contact between the bolt head and wheel barrel? I think I did use a fit checking template before installing my BBK but do not recall 100%. My set up is:

-19" RAC RG63 wheels (M3post.com group buy)
-Brembo kit, 6 piston front, 4 pistor rear, 380 mm discs front and rear

Either way this clearance seems too small. it seems to me that if any contact happens at all one can only conclude the clearance is too small. I suppose I should get a clearance checking template (paper/cardboard) and recheck things.

It would be greatly appreciated for anyone with these wheels and brakes or even any 19" wheels to have a quick look at their inner wheel barrels for some similar contact.

Cheers.

STALKER · 03-15-2012, 08:10 AM

I believe another member mentioned(Gixxer?) had the same issue with the same set up.

THE TECH · 03-15-2012, 08:11 AM

Must be your particular wheels.

M3pnoy · 03-15-2012, 08:24 AM

Quote:

Originally Posted by STALKER

I believe another member mentioned(Gixxer?) had the same issue with the same set up.

Yes Gixxer Kidd had the same problem i believe. I think its when your on a gravel road and rocks get stuck between the caliper and wheel.

Richard@M-World · 03-15-2012, 11:16 AM

+1 on gravel/debris. I get a lot of them from the track.

Also 1mm is probably too tight for clearance. I would recommend at least 2-3 depending on the caliper-wheel location.

STALKER · 03-15-2012, 11:22 AM

Quote:

Originally Posted by M3pnoy

Yes Gixxer Kidd had the same problem i believe. I think its when your on a gravel road and rocks get stuck between the caliper and wheel.

I don't think it was gravel in his case, but one of the bolts slightly scraping the inside of the wheel.
But hopefully he will chime in.

M3PO · 03-15-2012, 11:46 AM

Probably when the brakes heat up, there is just enough expansion of the metal to cause a slight rub.

swamp2 · 03-15-2012, 02:53 PM

Thanks for the replies. My case is not gravel or debris. I know because the marks on the wheels indicate a more precision "machining" type of action. Again my only conclusion is that the clearance is too small. I'll grab the fit template from Brembo. Anyone have it handy in pdf format?

Singletrack · 03-15-2012, 03:19 PM

Quote:

Originally Posted by M3pnoy

Yes Gixxer Kidd had the same problem i believe. I think its when your on a gravel road and rocks get stuck between the caliper and wheel.

This use to happen to me all the time on my stock STi wheels even...and I had about 4mm of clearance IIRC.

Richard@M-World · 03-15-2012, 06:34 PM

Quote:

Originally Posted by swamp2

Thanks for the replies. My case is not gravel or debris. I know because the marks on the wheels indicate a more precision "machining" type of action. Again my only conclusion is that the clearance is too small. I'll grab the fit template from Brembo. Anyone have it handy in pdf format?

Templates attached.

spdy330 · 03-15-2012, 06:56 PM

I just ordered a set of 380 front and rear and hope I do not have this rubbing on my ZCP wheels.

gixxer_kidd · 03-15-2012, 08:20 PM

As mentioned I had this issue with my RACs and now with my Volks. Both due to gravel and crap on the road/track. The Brembo 380mm kit is just way too big!

alpina527 · 03-16-2012, 07:11 AM

Quote:

Originally Posted by gixxer_kidd

As mentioned I had this issue with my RACs and now with my Volks. Both due to gravel and crap on the road/track. The Brembo 380mm kit is just way too big!

Nothing wrong with the brakes being too big. It's the wheels that are the problem. I have at least 10mm clearance around my oem 19s

e92zero · 03-16-2012, 11:04 AM

^does this mean the RAC has less clearance for BBK than the stock 19"? I thought the RAC was designed to clear BBK.

gixxer_kidd · 03-16-2012, 05:43 PM

Quote:

Originally Posted by alpina527

Nothing wrong with the brakes being too big. It's the wheels that are the problem. I have at least 10mm clearance around my oem 19s

My point was, it's difficult to find wheels that clear these brakes especially in an 18" setup for the track.

THE TECH · 03-16-2012, 05:53 PM

Quote:

Originally Posted by spdy330

I just ordered a set of 380 front and rear and hope I do not have this rubbing on my ZCP wheels.

Shouldn't be an issue.

spdy330 · 03-16-2012, 06:57 PM

Thanks you!

Quote:

Originally Posted by THE TECH

Shouldn't be an issue.

swamp2 · 03-17-2012, 01:54 AM

Quote:

Originally Posted by alpina527

Nothing wrong with the brakes being too big. It's the wheels that are the problem. I have at least 10mm clearance around my oem 19s

The problem is not at all clearance between wheel and caliper BODY. The low clearance spots are between the hex head cap screws which secure the caliper bodies to the brake brackets (probably a more precise term for that...).

Have another look, I think you may be surprised.

swamp2 · 03-17-2012, 01:56 AM

Quote:

Originally Posted by gixxer_kidd

As mentioned I had this issue with my RACs and now with my Volks. Both due to gravel and crap on the road/track. The Brembo 380mm kit is just way too big!

Thanks. Did you check the fitment kit the Brembo templates. I'm pretty sure I did and pretty sure it all looked fine. Unfortunately, I just cannot remember with 100% certainty.

gixxer_kidd · 03-19-2012, 03:02 PM

Quote:

Originally Posted by swamp2

Thanks. Did you check the fitment kit the Brembo templates. I'm pretty sure I did and pretty sure it all looked fine. Unfortunately, I just cannot remember with 100% certainty.

I'm pretty sure I sent RAC the template during the group buy to confirm that they would fit, and they confirmed that they would clear.

For me, the scratch marks were not aligned with the caliper bolts so I know for sure it's not the bolts. It's all the gravel/small rocks that get's lodged in between the caliper and wheel that causes the scratches.

Just came back from a 2 day track event, and I'm happy to report no new scratches on my volks. I guess the crap that they're using to fill in the potholes around me is causing the problem. Plus my RS3 tires are so sticky that it picks up everything.

03-15-2012, 01:44 AM	#1
swamp2 Major General Drives: E92 M3 Join Date: Sep 2006 Location: San Diego, CA USA Posts: 8,315 iTrader: (1)	Brembo BBK rubbing Has anyone noticed any rubbing of their Brembo BBK? When swapping out my tires I thought the shop scratched the inner barrels of my wheels. Both rear and one front wheel have some marks on the inner barrels that look like fine machining marks through the paint and into the metal (serious bummer...). After speaking to the guy who did the tires he noticed these marks before beginning the work. They are lined up well with the hex mounting bolts that attach the caliper to the mounting bracket. The clearance between the bolt head and the inner diameter of my rear wheels is very small, probably 1 mm or less (0.04" or less). The clearance on the fronts is maybe double that but I don't recall exactly. Either way it is larger. Perhaps a big pothole or other road irregularity, perhaps combined with low tire pressure caused just enough distortion in the wheel assembly to make contact between the bolt head and wheel barrel? I think I did use a fit checking template before installing my BBK but do not recall 100%. My set up is: -19" RAC RG63 wheels (M3post.com group buy) -Brembo kit, 6 piston front, 4 pistor rear, 380 mm discs front and rear Either way this clearance seems too small. it seems to me that if any contact happens at all one can only conclude the clearance is too small. I suppose I should get a clearance checking template (paper/cardboard) and recheck things. It would be greatly appreciated for anyone with these wheels and brakes or even any 19" wheels to have a quick look at their inner wheel barrels for some similar contact. Cheers. __________________ E92 M3 \| Space Gray on Fox Red \| M-DCT \| CF Roof \| RAC RG63 Wheels \| Brembo 380mm BBK \| \| Vorsteiner Ti Exhaust \| Matte Black Grilles/Side Gills/Rear Emblem/Mirrors \| \| Alekshop Back up Camera \| GP Thunders \| BMW Aluminum Pedals \| Elite Angels \| \| VentureShield Full Front Wrap \| Hardwired V1 \| Interior Xenon Light Kit \|
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03-15-2012, 08:10 AM	#2
STALKER Brigadier General Drives: 2008 E90 M3 Join Date: Feb 2009 Location: Toronto, ON Posts: 3,408 iTrader: (5)	I believe another member mentioned(Gixxer?) had the same issue with the same set up. __________________ 2008 AW/FR E90 M3-SOLD 2013 991 C4S-Produced, but not delivered.

03-15-2012, 08:11 AM	#3
THE TECH BimmerPost Supporting Vendor Drives: BPMsport 2012 E92 M3 Join Date: Jun 2011 Location: Kansas Posts: 11,906 iTrader: (39)	Must be your particular wheels. __________________ Check us out on Facebook at BPMsportLabs

03-15-2012, 11:16 AM	#5
Richard@M-World BimmerPost Supporting Vendor Drives: NASA TTA #92 M3 Join Date: May 2011 Location: TX/IL Posts: 622 iTrader: (0)	+1 on gravel/debris. I get a lot of them from the track. Also 1mm is probably too tight for clearance. I would recommend at least 2-3 depending on the caliper-wheel location. __________________ Authorized AiM Dealer & Data Specialist - AiM Solo \| AiM Solo DL \| AiM SmartyCam HD Authorized Pagid Brake Pads Dealer - RS19 \| RS29 \| RS14 for M3/1M OEM Calipers, StopTech, AP Racing, Alcon & Brembo w: www.m-world.us e: info@m-world.us t: 832-408-1234

03-15-2012, 02:53 PM	#8
swamp2 Major General Drives: E92 M3 Join Date: Sep 2006 Location: San Diego, CA USA Posts: 8,315 iTrader: (1)	Thanks for the replies. My case is not gravel or debris. I know because the marks on the wheels indicate a more precision "machining" type of action. Again my only conclusion is that the clearance is too small. I'll grab the fit template from Brembo. Anyone have it handy in pdf format? __________________ E92 M3 \| Space Gray on Fox Red \| M-DCT \| CF Roof \| RAC RG63 Wheels \| Brembo 380mm BBK \| \| Vorsteiner Ti Exhaust \| Matte Black Grilles/Side Gills/Rear Emblem/Mirrors \| \| Alekshop Back up Camera \| GP Thunders \| BMW Aluminum Pedals \| Elite Angels \| \| VentureShield Full Front Wrap \| Hardwired V1 \| Interior Xenon Light Kit \|

03-15-2012, 11:46 AM	#7
M3PO Colonel Drives: '08 IB E92 Join Date: Sep 2011 Location: OC Posts: 2,176 iTrader: (6)	Probably when the brakes heat up, there is just enough expansion of the metal to cause a slight rub.

03-15-2012, 06:56 PM	#11
spdy330 Major General Drives: 05 Tundra, 11 M3, 08 Odyssey Join Date: Dec 2009 Location: SoCal Posts: 5,495 iTrader: (136) Garage List 2011.75 BMW M3 [4.40] 2006 BMW 330i - SOLD [5.00]	I just ordered a set of 380 front and rear and hope I do not have this rubbing on my ZCP wheels. __________________ - 2006 E90 330i TiAG retired. - 2011.75 E90 M3 - BMW Performance Exhaust, BMW Performance Grills, Lux H8 V3, IND Reflectors, Ceramic Tint 58%, Brembo 380mm BBK, V1 with custom multi-color display by www.Radar-Mirror.com - custom radar mount by www.performancepackage.com.

03-15-2012, 08:20 PM	#12
gixxer_kidd Major Drives: e92 m3 Join Date: Dec 2008 Location: NNJ Posts: 1,362 iTrader: (11) Garage List 2008 m3 [5.00]	As mentioned I had this issue with my RACs and now with my Volks. Both due to gravel and crap on the road/track. The Brembo 380mm kit is just way too big!

03-16-2012, 11:04 AM	#14
e92zero First Lieutenant Drives: 2011 E92 BW Join Date: May 2010 Location: somewhere in US Posts: 357 iTrader: (0)	^does this mean the RAC has less clearance for BBK than the stock 19"? I thought the RAC was designed to clear BBK.

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