Quote:
Originally Posted by F87source
Some bolts are recommended to be changed even though there is not angle to the torque spec, but that's because they're still torqued to plastic deformation range. A good example is the brake caliper bolts, the front and rear caliper carrier bolts are the exact same. However only the rear caliper bolts require a torque angle, yet you have to replace them with each use. This is because the front bolts are torqued high enough to become plastically deformed, thus they're single use. Iirc the front bolts are 80 ftlbs, and the rears were like 30 ftlbs + 90 degrees.
Sometimes bmw specs to replace bolts because of corrosion issues and the risk of stripping, for instance the rotor retention bolts. These aren't torqued high enough to plastically deform yet they're replaced each time because they're so proned to coroding and stripping out.
The brace bolts are likely torqued to plastic deformation, hence why they're single use. So imo if bmw says to replace it, chances are it needs to be replaced or else you risk not getting accurate clamling loads or a broken bolt.
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I will probably replace them next time I am there, I will buy the bolts and next time I have to get in the engine bay for something I will put them back on. I just don't want to disconnect the oil thermostat lines again lol, can make such a mess. Def learned from the first time I did it, this time got no oil anywhere which is great. I am replacing the rubber seals this time cuz last time I forgot to order some, no leaks but not going to do it again.
I really need to slow down when I order stuff, always forget stuff lol, cheap stuff too which I then end up having to pay big shipping for like a bolt or a washer
