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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Mon, Dec-03-2018, 03:37:40 PM   #1
Exclusivs
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Default Caliper Carrier Bolts:

Hey guys

Just to note, a lot of brake/rotor DIYs list the caliper carrier bolts a 16mm.

In process of brake install & caliper carrier bolts are an 18mm.

Unsure when this spec was changed. These suckers are seized on pretty tight. So be prepared w a breaker bar or impact to break free.

Anyone know if these are one time use bolts?

Thanks in advance !


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Old Mon, Dec-03-2018, 05:14:53 PM   #2
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Default Re: Caliper Carrier Bolts:

Quote:
Originally Posted by Exclusivs View Post
Hey guys

Just to note, a lot of brake/rotor DIYs list the caliper carrier bolts a 16mm.

In process of brake install & caliper carrier bolts are an 18mm.

Unsure when this spec was changed. These suckers are seized on pretty tight. So be prepared w a breaker bar or impact to break free.

Anyone know if these are one time use bolts?

Thanks in advance !


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Caliper carrier bolts often have loctite, a little heat doesnt hurt to help break them free. Usually a breaker bar is plenty to loosen them up without issue or needing heat, I do not believe they are one time use.
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Old Mon, Dec-03-2018, 05:39:49 PM   #3
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Default Re: Caliper Carrier Bolts:

I just use a box end wrench and whack it with a hammer.

The bolts are reusable, not torque to yield. I donít think the BMW procedure calls for loctite but I use it. Not fun having one of those bolts back out.


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Old Mon, Dec-03-2018, 05:41:12 PM   #4
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Default Re: Caliper Carrier Bolts:

Know the rear carrier bolts have factory green loctite on them. The fronts donít appear to; but sure feel so.

Breaker bar , still no go. Hesitant to use heat/in that general area because of sensor etc. May have no other choice


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Old Mon, Dec-03-2018, 07:04:32 PM   #5
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Default Re: Caliper Carrier Bolts:

Quote:
Originally Posted by bigjae1976 View Post
I just use a box end wrench and whack it with a hammer.

The bolts are reusable, not torque to yield. I donít think the BMW procedure calls for loctite but I use it. Not fun having one of those bolts back out.


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Yeah, looking bit closer now. Believe there was life cycle change (2part #s)

That probably explains the 18mm head bolt now. Even w box wrench & hammer no go. PB no go. Guess need
Torch


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Old Mon, Dec-03-2018, 09:31:54 PM   #6
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Default Re: Caliper Carrier Bolts:

Sounds like someone didn't clean up the bolts/threads when they ware last out. Do that every time - no fail.

Just get a long-enough breaker bar on it and lean into it.
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Old Mon, Dec-03-2018, 09:34:11 PM   #7
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Default Re: Caliper Carrier Bolts:

Are you 100% sure that your carrier holes weren't simply enlarged and (perhaps poorly) tapped for larger threads? I've never come across 18mm heads for those.
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Old Tue, Dec-04-2018, 02:22:33 AM   #8
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Default Re: Caliper Carrier Bolts:

IIRC, fronts are M12 18mm, rears are M10 16mm.

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Old Tue, Dec-04-2018, 02:27:07 AM   #9
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Default Re: Caliper Carrier Bolts:

Mine's 16mm for both front and rear
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Old Tue, Dec-04-2018, 02:38:06 AM   #10
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Default Re: Caliper Carrier Bolts:

Quote:
Originally Posted by terraphantm View Post
Are you 100% sure that your carrier holes weren't simply enlarged and (perhaps poorly) tapped for larger threads? I've never come across 18mm heads for those.
Yes, 100% sure. Just removed , and not tapped. Extremely gummed up, yes.

Quote:
Originally Posted by mrgizmo04 View Post
IIRC, fronts are M12 18mm, rears are M10 16mm.

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Yep. 110% accurate.

Hence why I posted in my OP : most DIY's reported 16mm - I am here to confirm my fronts as well as GIZ & probably some other production models are an 18mm front.


In any event, thanks guys.

1/2" breaker bar needed for this.




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Discussing Caliper Carrier Bolts: in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)