Changed the disks on son's 2010 Seat Leon and needed to remove the caliper carrier to get the disks off.
The two bolts holding the carrier to the hub are usually torqued up pretty tight (200nm on the FL2).
We didnt have a manual and were in a hurry so searched on-line for info..
As the Leon, Golf, A3 and Octavia are all basically the same car and have corresponding models which share the same brakes, I was surprised to find a huge range of torque settings; ranging from 65nm to 190nm !!
These were all from professional garage youtube videos and not from a Joe Bloggs on his drive.
Obviously we checked that we were comparing identical brakes.

We eventually locate a copy of ElsaWin (the VAG workshop manual) which required a virtual machine to run Win95 and discovered the torque is 190nm.

Makes you wonder where those garages are getting their erroneous info from in the first place. Jules

Jules,

We need to work in Ft * LBS (because metric units are only used for Soda over here)


48 Ft * LBS

140 Ft * LBS



You didn't state the bolt size I will assume M14

For M14 The correct Torque when installed dry without Zinc plating depends on the Grade

M14 Grade 4.6........40 Ft * LBS

M14 Grade 8.8........103 Ft * LBS

M14 Grade 10.9........148 Ft * LBS

M14 Grade 12.9........173 Ft * LBS

If low grade bolts are used then the Torque will be lower because the low grade bolts can't handle the strain.


https://crafter.fastenal.com/static-assets...teners.pdf

Hopefully this makes sense.


What is the bolt marked with?

https://commons.wikimedia.org/wiki/Fastene...n_markings

Take care

Paul

PS if Land Rover specifies 148 Ft * LBS (Dry) I install my bolts at 111 Ft * LBS (Lubricated)

Thanks Paul
I looked at the bolt heads, but 11 years of British winter salted roads and my son living in Lowestoft (an East coast ex-fishing town) has removed any stamps that I could see from the bolts.
So we added Loctite to the threads.
I suggested he obtain some new bolts.

I would have assumed that VAG used the same bolts for identical brakes though. So to my mind that doesnt explain the torque differences. Jules

Jules,

I wouldn't assume that all of the VW group uses the same quality bolts.

A good friend of mine likes to say the following
(Translated from American to English or as close as I could get)

If General Motors is so concerned about quality and reliability then.....

Question: Why does G.M. use 10 Pence Switches?


Answer: Because the supplier ran out of 5 pence switches.


It is likely the same applies to E.V.E. (Evil Volkswagen Empire)

Take care

Paul

P.S. I do like VW but they are not beyond excessive cost cutting. For my Son's Jetta it didn't come with the custom rubber mat for the drink holder (the spec wasn't posh enough to get this) Note: I bought the part and paid full retail. The savings to VW was likely 20 Pence for the rubber (the mold was already made). Who do they think they are PORSCHE where they remove parts make the vehicle lighter and charge the customer more.

Jules,

I just checked for the LR2 (workshop manual search)


Front Caliper to Knuckle 145 FT*LBS

Rear Caliper to Knuckle 81 FT*LBS


I would need to look at the bolts on my LR2 but I suspect:
the fronts are M14 Grade 10.9 and
the rears are M12 Grade 10.9

(The torque shown above would make sense for these bolts)



If the Engineer specifies a smaller bolt or if the purchasing team buy a cheaper bolt it will affect the torque.



If the vehicle is light enough then the fronts could be M12 bolts

Thanks

Paul

PS I find Affect vs. Effect is very confusing (I think below is correct)

..........cheaper bolt it will affect the torque.
..........cheaper bolt it will have an effect on the torque.

If both of these are wrong I need to learn a new language.

I just tighten caliper bolts until my elbow clicks.  Past: FL2 TD4 HSE Auto
Evoque SD4 Dynamic Lux Auto
Present: Audi A3 S Line.

p_gill wrote:

Jules,

I just checked for the LR2 (workshop manual search)


Front Caliper to Knuckle 145 FT*LBS

:

which is almost 190nm

So at least your manual and mine concur.

Also your definitions are correct  Jules