Brake caliper fixings

[andrwboul]

Hi, just re torqued front caliper bolt (40 NM) it felt odd then sheared ! Now ordered a complete new set from dealer and I am going to replace them all. Any thoughts as to why it failed ? Is 40NM correct ? Doubt it has been over tightened in the past (first time been off the bike as far as I am aware)..thanks

[Britisherspy]

Did the bolt shear? Was it stainless steel or galvanised steel?

[milleplod]

I think its 24nm for the caliper bolts.....

Pete

[andrwboul]

Original fixing - steel . I must double check the torque figure ...can anybody confirm ? Thanks

[milleplod]

My workshop CD-ROM shows its the rear caliper bolts that are 24, fronts are 30Nm....that's for 1200 bikes though, which is what I assumed you had....sorry! 1100 models seem to be 40Nm, the 1150 ones show 30Nm too.

Pete

[Herb]

People frequently overtorque brake calliper bolts and they stretch. Probably original on a near 20 year old bike.

[SP250]

And some people change them for stainless which has nice bling, but lower shear limits.

[andrwboul]

Thanks all - 40 it is then

[dave the german]

According to Haynes, Non EVO brakes (10mm Allen bolt) 40Nm
EVO brakes (8MMTorx bolt) 30Nm

[andrwboul]

That's interesting mine being 8mm - thanks

[andrwboul]

Update - I decided to replace both front and rear caliper fixings - all from BMW. So new fronts all good - rears however supplied with allen head not torx as per original. Also they are an inferior quality (8.8 v 10.9). Anyone come across this before ?