[Silvoxer]

See picture attached.

Trying to change the rear rotors myself.
The two bolts (M12*1 with an E16 socket) in the back of the bracket just won’t come off. Tried wrench, ratchet + hammer, and penetrator. Nothing works.

Anyone with experience getting these bolts off?

Link to the bolts on FCP Euro: https://www.fcpeuro.com/products/bmw...nt-34116772117

[Stück]

Fastening torque is specified at 130Nm on this bolt, and it is listed as a single time use fastener in TIS.

You'll need a moderate length breaker bar to crack them free for the first time since production.

[Silvoxer]

Originally Posted by Stück

Fastening torque is specified at 130Nm on this bolt, and it is listed as a single time use fastener in TIS.

You'll need a moderate length breaker bar to crack them free for the first time since production.

Thank you! This is very helpful!

[Silvoxer]

Problem solved with a torque wrench. It was so difficult due to the lower arm of the suspension getting in the way of the long torque wrench. I had only one torque wrench click worth of room to work with, but got it done.

Had to get the torque above 200 Nm to get it unstuck.

[pbonsalb]

Not supposed to use a torque wrench to remove. Breaker bar or long handled ratchet for that. Torque wrench to reinstall. And yes, sometimes working range is limited. Wait till you have to do angle torque with limited range — you need an angle torque wrench that since you can’t estimate 90 degrees in 90 sweeps one 1 degree.

[Stück]

Break away torque will always be higher than fastening torque due to static friction that simply isn't present on a moving fastener.

Use a torque wrench for its intended purpose, and a breaker bar for its.

[AHall]

Originally Posted by Stück

Fastening torque is specified at 130Nm on this bolt, and it is listed as a single time use fastener in TIS.

You'll need a moderate length breaker bar to crack them free for the first time since production.

What is a TIS and where can I find it?

[martinm0]

Originally Posted by AHall

What is a TIS and where can I find it?

It's the BMW Technical Information System. A pay-for-technical info service effectively.

https://bmwtechinfo.bmwgroup.com/#/login

[pbonsalb]

I would not worry about reusing the caliper bracket bolts, even though BMW may say they are 1 time use. Torquing them to spec when reinstalling is a good idea unless you have a pretty good feel for tightness from experience.

[Aronis]

Originally Posted by Stück

Break away torque will always be higher than fastening torque due to static friction that simply isn't present on a moving fastener.

Use a torque wrench for its intended purpose, and a breaker bar for its.

Breaker bar can be challenging with it's limited starting point of rotation as they are typically two position devices. So if the space is tight a breaker bar may be difficult to get into position on the bolt in question. A large ratchet would be better than over torquing the torque wrench in question.

Mike

[pmsteinm]

Originally Posted by Aronis

Breaker bar can be challenging with it's limited starting point of rotation as they are typically two position devices. So if the space is tight a breaker bar may be difficult to get into position on the bolt in question. A large ratchet would be better than over torquing the torque wrench in question.

Mike

That is one reason back in the day I almost went with a Snap-On torque wrench because the ratchet has more stops for working in tighter spaces. But I settled on the CDI ones (same as Snap-on minus the ratchet head). I never break loose with a torque wrench. If the breaker won't fit I use a regular ratchet.