Caliper Bracket Bolts Size/Source

[bimmer]

I went to reinstall my rear caliper bracket and one of the bolts snapped under pressure before the 81ft lb torque was reached. After that experience, I figure I should replace all of these 16 year old bolts. Anyone know the specs for these bolts and where to source them? The BMW brand bolts retail for an absurd price ($15 per piece for the front!)

From RealOEM I found:

Fronts: M12 x 1.5, x 41. I can't for the life of me find 10.9 grade flanged bolts in M12 x 1.5. Anyone have a source for these?
Rears: M10 X 26.5. RealOEM is missing the thread pitch, does anyone know it?

Ideally I'd just go to the hardware store but given the whole being unable to leave my house thing right now I'm trying to source these online.

Thanks in advance for any help you guys can provide

[D-O]

The correct spec for the rear caliper bracket mount bolt is 48 ft lb. The torque spec guide posted on this forum (and previously on M3F) incorrectly specifies 81 ft lb for both the front and rear.

I attempted to torque my rear's to 81 ft lb but became concerned and stopped when I could not reach the spec. I dug out the Bentley manual and found that it specified 48 ft lb.

Have you tried McMaster-Carr (mcmaster.com) ?

Jesse

[bimmer]

I just noticed the same after checking newTIS. No wonder it snapped! I thought something didn't feel right and checked that torque thread like 3x to make sure. Should have gone to newTIS right away or just trusted my gut....ugh.

Thanks for the suggestion - I did try McMaster without any luck. I emailed them seeing if they could potentially source them. Since the rears are "only" $4 I may just suck it up and buy two for the ones I over tightened/snapped. I'm not so overly concerned with replacing them all now knowing that it only snapped because I near doubled the specified torque.

[Slideways]

The correct spec for the rear caliper bracket mount bolt is 48 ft lb. The torque spec guide posted on this forum (and previously on M3F) incorrectly specifies 81 ft lb for both the front and rear.

I attempted to torque my rear's to 81 ft lb but became concerned and stopped when I could not reach the spec. I dug out the Bentley manual and found that it specified 48 ft lb.

Have you tried McMaster-Carr (mcmaster.com) ?

Jesse

Is it from the PDF that Flow created? It has 48ft-lbs 65nm for the rear bracket bolts.

[bimmer]

The one reposted on this forum, which says it was created by Flow. It lists 81ft lbs. Maybe it was updated at some point?

https://nam3forum.com/forums/forum/m...ar-on-diagrams

[Slideways]

The one reposted on this forum, which says it was created by Flow. It lists 81ft lbs. Maybe it was updated at some point?

https://nam3forum.com/forums/forum/m...ar-on-diagrams

Mine is dated 2016-04-08

[mrgizmo04]

Mine is dated 2016-04-08

How many pages is your version? I know more recently there was information about the head/valves/cams/pistons added.

[Slideways]

How many pages is your version? I know more recently there was information about the head/valves/cams/pistons added.

76 pgs

[mrgizmo04]

76 pgs

Yeah interesting so I think 2016 version would not have that additional cam/valve/etc info yet, latest I think is about 98 pages. Weird that that spec (and maybe others(?)) would be different/incorrect.

[bimmer]

Found a link to the updated version in bimmerfan08's rod bearing DIY.

http://d.pr/f/1jtRu

[Arinb12]

Found a link to the updated version in bimmerfan08's rod bearing DIY.

http://d.pr/f/1jtRu

Can you up this anywhere? Link is dead...

[Flat-Six]

I went to reinstall my rear caliper bracket and one of the bolts snapped under pressure before the 81ft lb torque was reached. After that experience, I figure I should replace all of these 16 year old bolts. Anyone know the specs for these bolts and where to source them? The BMW brand bolts retail for an absurd price ($15 per piece for the front!)

From RealOEM I found:

Fronts: M12 x 1.5, x 41. I can't for the life of me find 10.9 grade flanged bolts in M12 x 1.5. Anyone have a source for these?
Rears: M10 X 26.5. RealOEM is missing the thread pitch, does anyone know it?

Ideally I'd just go to the hardware store but given the whole being unable to leave my house thing right now I'm trying to source these online.

Thanks in advance for any help you guys can provide

Did the same thing, and just ordered the correct bolts from FCP.

https://www.fcpeuro.com/products/bmw-caliper-bracket-bolt-rear-34203414763

[bimmer]

Can you up this anywhere? Link is dead...

If you go to the sticky thread someone uploaded the correct version to their google drive. Page 2 of the thread I believe.