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Old 08-20-2013, 06:37 PM   #1
intensifi

 
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Partially stripped threads on Brembo calipers

In the spirit of Dustin Hoffman...

"Is it safe" or are these no longer useable???

The pictures with the red highlighting show the depth of the missing thread area.

Each caliper has one good threaded orifice. Each caliper has one "partially stripped" orifice.

Update: The Time-Sert inserts worked well. There is one snag though. The Loctite on the caliper bolts holds more strongly than the Time-Sert does. So when you reverse the bolts for removal, the Time-Sert insert loosens instead of the bolt through the insert.

This is no dig on the Time-Sert insert, they are in very tight and "seal" into the new threads as the new bolt is inserted. It's just that the GM Loctite is stronger.

Next time, I'll inspect used calipers more thoroughly.
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Last edited by intensifi; 03-24-2014 at 08:51 AM.
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Old 08-20-2013, 07:17 PM   #2
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I'm not going out on a limb and say one way or the other, but, if they were mine, I'd drill them out completely and Heli-Coil them.
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Old 08-20-2013, 07:59 PM   #3
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If you need higher clamping force/torque than a Heli-Coil can handle, look into a company called Time-Sert. I'm using one in my '95 Montero to replace the threads in my crankshaft since the crank bolt broke and getting it out trashed the old threads. It will easily hold the 135 ft-lbs necessary for that application, so just saying, it can hold better.

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Old 08-20-2013, 08:59 PM   #4
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Yea, I forgot about the Time-Sert. You should have enough material there to install them. Best place to find them would probably be a Caddy dealer as they were used to repair the old Northstar head bolt holes in the block.
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Old 08-21-2013, 12:53 PM   #5
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Any idea on sizes needed for either the Heli-Coil or Time-Sert?
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Old 08-21-2013, 09:06 PM   #6
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Quote:
Originally Posted by intensifi View Post
Any idea on sizes needed for either the Heli-Coil or Time-Sert?
Just get them to fit the bolts you already have.
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Old 08-25-2013, 09:09 PM   #7
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I'm buying the time-sert tool to rethread mine. Thanks JohnnyBFromPeoria!

I wonder if I'm rethreading one bolt hole on each front caliper, if I should just do both at the same time??? Maybe stronger that way???

Any mechanical engineers out there to answer?
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Old 08-28-2013, 01:06 AM   #8
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The time-sert tool set arrived today. I must say this is one very well engineered and machined kit.
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Old 08-28-2013, 03:21 PM   #9
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Use new bolts!!! The caliper bolts are torque to yield...
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Old 08-28-2013, 03:48 PM   #10
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Use new bolts!!! The caliper bolts are torque to yield...
I am. The time sert kit will just replace the threads in the caliper and make them much stronger.
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Old 08-28-2013, 05:05 PM   #11
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All threads have a striped appearance. But those look stripped.





























































Sorry. Couldn't resist.
I crack myself up!
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Old 08-29-2013, 04:09 PM   #12
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Quote:
Originally Posted by intensifi View Post
I'm buying the time-sert tool to rethread mine. Thanks JohnnyBFromPeoria!

I wonder if I'm rethreading one bolt hole on each front caliper, if I should just do both at the same time??? Maybe stronger that way???

Any mechanical engineers out there to answer?
If the threads in the other bolt holes are fine there's no need to re-thread them. What i would recommend you do is get a tap the same size as the original bolt holes and trace the threads on all of them to make sure you dont end up stripping out another.
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