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There's more forum threads collapsing than wheels on this topic.
I'd like to keep it open, as more info can be added.
So far we've learned....
A) It's still an open case and no actual cause has been established yet.
B) There was a wheel manufacture change around 2012, but no relavance is yet applied to this.
C) Speculation aimed at cause....
i) Operator error, not tightening bolts after DIY Service
ii) BMW dealer error, mechanical failure in some way
iii) Caliper bolts coming loose
iv) Spokes on wheel coming loose due to rim damage or grub screws falling out
D) Remedies suggested are
i) to check bolts and apply tamper proof paint for easy visual check on any bolt movement.
ii) to always replace bolts with brand new ones from BMW, as they are microencapsulated already with thread lock.
E) You dont need to remove caliper to change pads, but you should clean pistons before pushing them back through the seals.
Thats about it I think.
I'd like to keep it open, as more info can be added.
So far we've learned....
A) It's still an open case and no actual cause has been established yet.
B) There was a wheel manufacture change around 2012, but no relavance is yet applied to this.
C) Speculation aimed at cause....
i) Operator error, not tightening bolts after DIY Service
ii) BMW dealer error, mechanical failure in some way
iii) Caliper bolts coming loose
iv) Spokes on wheel coming loose due to rim damage or grub screws falling out
D) Remedies suggested are
i) to check bolts and apply tamper proof paint for easy visual check on any bolt movement.
ii) to always replace bolts with brand new ones from BMW, as they are microencapsulated already with thread lock.
E) You dont need to remove caliper to change pads, but you should clean pistons before pushing them back through the seals.
Thats about it I think.