Facelift A3 8V front caliper carrier bolt torque?

[Nessy]

I need to change my A3 8V front discs and pads tomorrow due to an impending MOT test, but am having difficulty finding out the torque for the bolts that hold the caliper carrier to the hub.
A few sources via Google say 190-200Nm but this seems crazily high?
On my old A3 8P (which in terms of brakes seems very similar to the 8V) and TT the figure is only 125Nm/92lbft?
Anyone know what the official Audi figure is?
Thanks

 

[Mikeso51]

I would be interested in the answer to this as well. Also good to know of if the bolts can be re-used.

 

[Nessy]

Well the job is done.
I should add that I’ve had the discs & pads for almost a year as the only advisory on the last MOT was slightly worn front discs…….well 7K miles later I decided that they were looking a bit ropey and needed to be done before the next test.

Having read last year that the caliper bolts on the 8V should be replaced I did buy replacements (Febi 48810) and these were used today too.

Having done this job several times on my old 8P (when the bolts IIRC did not need to be replaced) I think that the stipulation to replace the bolts on the 8V comes from the fact that they probably stretch when torqued to the much higher figure?
The Febi bolts that I put back on the car are marked 10.9 so are high tensile.
In the end I decided on using 175Nm.
First I torqued up the new bolts to 125Nm and then to 175Nm, the movement of the bolt between the two settings was tiny (I’d guess 20 degrees) so even if the figure is 200Nm am sure mine will be OK.
They are definitely tight at 175Nm .

 

[SDB]

I did this job on my 8V back in 2022 and I had two sources for the torque - 196Nm and 200Nm (see pic).
They are definitely 'stretch bolts so should be replaced each time. Once they yield after tightening if you refit them there's a danger they may snap with such a high torque for a second time.
I think you'll be fine at 175Nm it's pretty damn tight.

 

[Nessy]

I did this job on my 8V back in 2022 and I had two sources for the torque - 196Nm and 200Nm (see pic).
They are definitely 'stretch bolts so should be replaced each time. Once they yield after tightening if you refit them there's a danger they may snap with such a high torque for a second time.
I think you'll be fine at 175Nm it's pretty damn tight.

Thanks, I don’t think that mine will come undone in a hurry, 175Nm is tight…….
Can’t help but wonder why the change though from 8P to 8V….. brakes almost identical but the requirement to change bolts only on the later set-up.
Guess we will never know…

 

[SDB]

There are a lot of stretch bolts being used these day's particularly for suspension and braking parts (safety critical stuff).
When I've changed the dampers and coil springs the bolts have all been of this type.
It's a pain having to source these, as they often don't come with the parts you are changing.

 

[Nessy]

There are a lot of stretch bolts being used these day's particularly for suspension and braking parts (safety critical stuff).
When I've changed the dampers and coil springs the bolts have all been of this type.
It's a pain having to source these, as they often don't come with the parts you are changing.

It‘s just pointless expense and complexity in my book.
Can understand it for things like subframe bolts etc but for stuff that gets removed/replaced as part of servicing & maintenance then it seems a retrograde step to me….