[s-cars] Brake Caliper to Caliper Bracket Bolts

[Tom Green]

Manny,

That's usually an Audi recommendation to change hardware, and to  
inspect it in every case.  For the small M6 bolts for the carrier pin  
on OEM Girling calipers it is good advice since those small bolts are  
easily (and often) overtorqued, and those are the bolts that arrive  
in the box with several brands of pads.  The caliper is restrained in  
the carrier so these bolts don't carry the force on the caliper when  
braking.  The caliper carrier to hub M12 bolts are torqued at 92 lb-ft.

The Porsche caliper mounting bolts are more robust because they do  
carry the braking force.  The M12 bolts from Porsche are 10.9 grade  
which would suggest 85 lb-ft max.  The 12.9 grade can carry 95 lb-ft  
but I am not sure they need that 92 lb-ft.  Are we talking 993tt  
calipers to RS2 adapter brackets on S8 rotors or  aluminum adapters  
for 993tt rotors ?  I think the aluminum adapters call for 62 lb-ft  
and I believe that is the Porsche spec as well.  Porsche does not  
call for replacing that bolt, just inspect it and the bracket.  You  
are not torquing to yield in either case.

If you are wanting a spare set of bolts, I would just get them from  
Porsche.

Tom

> Date: Sun, 26 Oct 2008 13:45:35 -0400 (EDT)
> From: <manuelsanchez at starpower.net>
> Subject: Re: [s-cars] Brake Caliper to Caliper Bracket Bolts
> To: theringmeister at triad.rr.com
> Cc: s-car-list at audifans.com
> Message-ID: <20081026134535.BUQ54516 at ms15.lnh.mail.rcn.net>
> Content-Type: text/plain; charset=us-ascii
>
>
> Wylie,
>
> Thanks for the info.
>
> The aftermarket pads I get for the BBK just come with the pads, and  
> it's been a long time since I bought stock pads for the front, so I  
> don't have any memory of the bolt issue.
>
> I was thinking that if there was a grade difference in the bolts  
> that there may be a different torque specification. I'll ping 034  
> tomorrow and see what they recommend.
>
> For better or worse I have been re-using these bolts, but I am  
> swapping rotors now, so it seems like a good time to change them.  
> They are pricey though, 8 bucks a pop. I wish I could find a local  
> source that might be cheaper. Better safe than sorry I suppose.
>
> Regards,
>
> -Manny
>
>
> Manny,
> I know in many cases a set of pads will come with replacement  
> caliper mounting bolts. That would at least lead me to believe it's  
> a good idea if not an absolute requirement. As far as the bolt  
> grade, that sounds like it should be sufficiently strong, but  
> without having any reference at hand, that's purely speculative.
>
> Wylie Bean (via blackberry)
> 90 cq
> 91 90q20v
> 92 UrS4
> 01 allroad
>
> -----Original Message-----
> From: Manuel Sanchez <manuelsanchez at ifmm.com>
>
> Date: Sun, 26 Oct 2008 12:32:00
> To: Scar<s-car-list at audifans.com>
> Subject: [s-cars] Brake Caliper to Caliper Bracket Bolts
>
>
> Fellow S-Heads,
>
> Are the Bolts used to secure the Caliper to the Caliper Mounting
> bracket re-usable or are they supposed to be replaced each time?
>
> I can't really find a reference to this question in the Bentley.
>
> I believe these bolts are supposed to be tightened to 92 ft lb /
> 125Nm of torque, correct?
>
> This is for a 993TT BBK, if it makes a difference (probably does).
> I'm not sure of the grade of bolts in a stock set-up, but my
> replacement set coming from 034 is Grade 12.9. Anyone know the stock
> bolt grade?
>
> TIA
>
> Manny
>
> 95.5 urS6 Avant
> _______________________________________________
> S-CAR-List mailing list
> S-CAR-List at audifans.com
> http://www.audifans.com/mailman/listinfo/s-car-list
>
>
> ------------------------------
>
> _______________________________________________
> S-CAR-List mailing list
> S-CAR-List at audifans.com
> http://www.audifans.com/mailman/listinfo/s-car-list
>
>
> End of S-CAR-List Digest, Vol 60, Issue 41
> ******************************************