Correct caliper bolts

[wetwork65]

I was under the impression that if you’re given a torque setting of x plus x degrees that it is for torque to yield bolts and that the x degrees is for the bolt to stretch. (Meaning single use)

Where as if your given a torque setting of x and that’s it then you can reuse the bolts

Yes agree. The angle stipulated is more precise and will give a known percentage of strain by a direct calculation. (i.e. the distance along an inclined plane, which is the nut travelling along the thread)
If the bolt is being stressed beyond yield, then the bolt will start to go "loose" and be on its path to failure. Thus I would not expect these to be torque to yield.
Anyone here recall the stress/strain graph from Mech Eng days?

 

[vc commodore]

What I find rather humourious about this thread is, I have never seen anyone, nor have I used a torque wrench on caliper bolts, when ever they have been removed and put back in.

And I've done thousands, and seen just as many being done and never ever had issues.....

 

[wetwork65]

What I find rather humourious about this thread is, I have never seen anyone, nor have I used a torque wrench on caliper bolts, when ever they have been removed and put back in.

And I've done thousands, and seen just as many being done and never ever had issues.....

I use a torque wrench to make sure they are done up f-ing tight, but I'm a pedant.

 

[greenacc]

By torquing then to angle this also eliminates the effects of any lubricant on the thread like thread locker or misplaced slide grease. If you torque up a lubricated thread to a dry torque spec you will over torque the fastener and actually snap the bolt in some cases.

 

[EYY]

I was under the impression that if you’re given a torque setting of x plus x degrees that it is for torque to yield bolts and that the x degrees is for the bolt to stretch. (Meaning single use)

Where as if your given a torque setting of x and that’s it then you can reuse the bolts

Yep it's a VERY common misconception.

 

[lmoengnr]

I use a torque wrench to make sure they are done up f-ing tight, but I'm a pedant.

F-ing tight is a great all round torque figure.

 

[Geoff6666]

A mechanic I know used to always say tighten bolts till they snap off then back off half a turn!

 

[greenacc]

F-ing tight is a great all round torque figure.

It scares me how loose most torque specs are. When I do most bolts up by feel they always end up higher than the torque spec.

 

[justice4all3000]

I changed my front rotors this weekend I just cleaned the bolts with a wire brush, applied blue loctite and tightened them to spec. Years ago when I had to change the front strut top mounts the service manual asked for new bolts I spoke to the holden parts department and they told me they don't even bother to replace them!!

 

[losh1971]

Was the consensus that the caliper bolts on these need replacing? I wanted to pull the rotors tomorrow to inspect the shoes on the VE ute but won't be able to get new bolts anywhere as I'm in iso.