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Rear Brake Rotor Bolts

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  #21  
Old 04-19-2019, 05:31 AM
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Originally Posted by Cossack84
Did you design those bolts? Do you know what material they are made out of? How in the heck do you know that those bolts are not YTT?
Stop spreading fake claims and going against manufacturers mandate.
As a mechanical engineer, I do know the rotor bolts are not torque to yield in this application.

You can replace the bolts if you wish, there is no harm in doing so. You can get as hysterical about it as you wish. Though doing so doesn't make your claims right.
 
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  #22  
Old 04-19-2019, 06:51 AM
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Originally Posted by Cossack84
Did you design those bolts? Do you know what material they are made out of? How in the heck do you know that those bolts are not YTT?
Stop spreading fake claims and going against manufacturers mandate.
A TTY bolt will specify a torque, then an additional degreed rotation to obtain the correct stretch.
 
  #23  
Old 04-19-2019, 07:07 AM
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Originally Posted by foxtrapper
As a mechanical engineer, I do know the rotor bolts are not torque to yield in this application.

You can replace the bolts if you wish, there is no harm in doing so. You can get as hysterical about it as you wish. Though doing so doesn't make your claims right.
Thats great to know your professional back ground. But this is the fourth time I’m asking this question here, how do you know those are not TTY? Out of all people here, you should be the first one not to make any assumptions about critical fasteners and, above all you should not be recommending public to go against the repair manual.
Again, what do you base your recommendation to ignore manufacturers mandate?
 
  #24  
Old 04-19-2019, 07:09 AM
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Originally Posted by caulk04
A TTY bolt will specify a torque, then an additional degreed rotation to obtain the correct stretch.
So the answer is you have no clue?
 
  #25  
Old 04-19-2019, 08:10 AM
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Originally Posted by Cossack84
Again, what do you base your recommendation to ignore manufacturers mandate?
Because the torque value is too low to cause plastic deformation of the bolt.
Without plastic deformation the bolt remains unchanged.
 
  #26  
Old 04-19-2019, 08:17 AM
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The real stress on rotor bolts with factory loctite comes during removal. I'm tighter than an Amish tick; I view them as a one time use item.
 
  #27  
Old 04-19-2019, 08:24 AM
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Ah, but it's not the stress, it's the responsive strain that matters!
 
  #28  
Old 04-19-2019, 08:29 AM
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Originally Posted by foxtrapper
Ah, but it's not the stress, it's the responsive strain that matters!
I'm straining to not respond :>)
 
  #29  
Old 04-19-2019, 08:43 AM
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Originally Posted by foxtrapper
Because the torque value is too low to cause plastic deformation of the bolt.
Without plastic deformation the bolt remains unchanged.
That torque value depends on fastener’s size, thread pitch, material it’s made out of, hardness level and if that bolt is going in dry.
What are the torque value, bolt material and Is it dry?
 

Last edited by Cossack84; 04-19-2019 at 08:45 AM.
  #30  
Old 04-19-2019, 08:54 AM
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Okay ... I tried but wasn't able to control myself ... This conversation goes kind of like one I had years ago with a guy who was restoring a 37 Chevrolet ... He worked at the GM Proving Grounds ( in the noise and vibration dept ) and wanted an exhaust system fabbed for his ride ... I'd been building systems for the local "rodders" for years and had done a lot of work for guys at the Grounds ... We got into the specifics of what he wanted and one thing led to another ... Finally he wanted to know what the material ( rubber ) of the hangers was made from and would it be comparable to what GM used back in the day ... After a second I gathered my thoughts and responded "Probably not but neither is the Big Block that your're stuffing between the fenders ... Dealing with engineers can be a struggle as they're an expert ( maybe so ) on most every topic and sometimes don;t see the forest for the trees ... Just an observation ...
 
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