Front Calliper Attachment Bolts. Size/type.....

[Liam Gunby]

As above guys, needing to remove callipers soon for new disks and i don't have the socket. Hex i think it is???
any one know the size or a link to where i can get one?

Thank you

 

[turkie172]

Buy a Hex socket set I'm sure it's a 12 if you buy one socket you would nearly have paid for a set.

 

[Foxspeed]

12mm hex

 

[shogun]

Halfords do a 12mm hex 1/2" socket for around a fiver. Had to buy one as the biggest one in my set was 10mm. They require torqing up to 100nm.

 

[Foxspeed]

Halfords do a 12mm hex 1/2" socket for around a fiver. Had to buy one as the biggest one in my set was 10mm. They require torqing up to 100nm.

its more than 100nm!

 

[shogun]

its more than 100nm!

Oops. 170NM. Don't know why it's listed as 110NM in the service manual and then 170 in brackets?

 

[tcw]

Careful with doing them up to 170NM - it's an aluminium thread - 110NM should suffice.

 

[turkie172]

I just do them up as tight as I would do a wheel nut or a little less there is a lot of thread on it so it could take 170Nm but I think it's a bit overkill.

 

[shogun]

Well this is from the workshop manual so it's either 102nm or 170nm.... which one is it?

 

[Antti O]

This is from service manual page 31A-8

Torque tighten the brake calliper mounting bolts
(170 Nm).

 

[Doogle]

Are they stretch bolts that need replacing?

 

[Foxspeed]

no

 

[LOCKE]

Well this is from the workshop manual so it's either 102nm or 170nm.... which one is it?

Possibly tighten both bolts to 102 then 170?

 

[tombate911]

Be very careful tightening these bolts up to the factory spec! I have done it and two occasions stripped the thread out of the hub. I now only torque them by feel which I would say is in the region of 100nm but much prefer doing them by hand now with 1/2 Ratchet.

 

[Foxspeed]

Be very careful tightening these bolts up to the factory spec! I have done it and two occasions stripped the thread out of the hub. I now only torque them by feel which I would say is in the region of 100nm but much prefer doing them by hand now with 1/2 Ratchet.

good advice as they are into the alloy hub what i would add to this is make sure the threads are clean & use a bit of wd40 or like to help as tight threads can pull the metal out of the alloy hubs

 

[shogun]

Would a lubricated thread cause you to overtighten the bolt for the same torque rating?

 

[tombate911]

Would a lubricated thread cause you to overtighten the bolt for the same torque rating?

Yes. Adding lubrication to a thread will change the torque required to get it to it's dry torque value. However it depends on the specification in the manual, some components will state a wet torque figure to take into consideration of some form of compound being applied, these hubs being a perfect example a steel bolt into an Alu casting. Being just a car component and what I remember seeing it will just be a dry torque value. I'll check the manual tomorrow though.