Quote:
Originally Posted by bmw2x
I think you shouldn't be doing 30Nm + 90° more than once (the first time only). Repeating the procedure would stretch the bolts and they could snap.
Imo, if you have to reuse the rear bolts, it should be just a fixed torque. Something like 70Nm with some threadlocker. The front bolts are 110Nm, but have 30% more thread.
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Typically I'm in agreement. Note that BMW's tightening specifications does permit one to renew the carrier bolts instead of replacing.
Also, 30 Nm is only ~22 ft-lbs, which is barely hand tight. It doesn't appear to be a stretch bolt situation like it would be for cylinder head bolts.
I always use blue threadlocker for added protection.