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Cradle Bolt question - To threadlock or not? by Wichita
Started on: 06-13-2022 10:56 PM
Replies: 14 (295 views)
Last post by: Wichita on 06-18-2022 12:13 AM
Wichita
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Report this Post06-13-2022 10:56 PM Click Here to See the Profile for WichitaSend a Private Message to WichitaEdit/Delete MessageReply w/QuoteDirect Link to This Post
Just curious if anyone thinks it is a good idea to apply, at least orange or blue, threadlocker on the cradle bolts?

The only thing I may worry about is the rear ones, if I do apply some removable threadlocker, and decide to remove the cradle in the future, if I would be putting the cradle nuts in a jeopardizing position where they would break and spin.

Maybe I'm just overthinking it. There is really no rust and they came out without a ton of effort, so maybe I'm ok just slapping it back in without threadlocker.

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Report this Post06-14-2022 08:08 AM Click Here to See the Profile for fierofoolClick Here to visit fierofool's HomePageSend a Private Message to fierofoolEdit/Delete MessageReply w/QuoteDirect Link to This Post
I believe the nuts are swaged, but I would share the concern about breaking the cage nuts free if a thread locker was used. My 87 cradle has been out about 4 times since I bought it in 2001. Never any thread locker. Never an issue with the cradle bolts coming loose. Just make sure they're tightened to specification when installing them.
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Report this Post06-14-2022 01:26 PM Click Here to See the Profile for FrenchrafeSend a Private Message to FrenchrafeEdit/Delete MessageReply w/QuoteDirect Link to This Post
I grease my cradle bolts because I like to be able to undo them again!
My Fiero is used on trackdays and I've never had a cradle bolt losen off.
I think Loctite is a bit overkill in this situation.
Regards, Rafe

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Report this Post06-14-2022 06:59 PM Click Here to See the Profile for SpoonSend a Private Message to SpoonEdit/Delete MessageReply w/QuoteDirect Link to This Post
No thread-locker needed.
Most cases the rust acts as thread-locker. Anti-Seize may be better and torqued properly. Research dry torque vs wet torque.

Spoon


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Report this Post06-14-2022 08:32 PM Click Here to See the Profile for skywurzClick Here to visit skywurz's HomePageSend a Private Message to skywurzEdit/Delete MessageReply w/QuoteDirect Link to This Post
Anti-Seize and torqued properly.
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Report this Post06-14-2022 10:53 PM Click Here to See the Profile for Dennis LaGruaSend a Private Message to Dennis LaGruaEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by skywurz:

Anti-Seize and torqued properly.


That is all that is needed.

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Wichita
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Report this Post06-14-2022 11:15 PM Click Here to See the Profile for WichitaSend a Private Message to WichitaEdit/Delete MessageReply w/QuoteDirect Link to This Post
Thanks everyone.

I was checking on some past PFF threads about this. Seems like that anti-seize is a go to for many people. Wet torque value seems to vary between 25% to 40% reduction vs dry.

There seems to be a debate that purple threadlocker is really good as an anti-seize. I've seen orange in a lot of GM factory applications on newer vehicles, especially brake parts.

Maybe I'm overthinking this and I should just go to dry route. I was able to unbolt the cradle bolts without any issues, so maybe I'm ok to put them back in without worry about them seizing. (I don't plan to drive the Fiero in the winter nor do I live in a high road salt use area).

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Report this Post06-16-2022 04:55 PM Click Here to See the Profile for SpoonSend a Private Message to SpoonEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Wichita:

Thanks everyone.

I've seen orange in a lot of GM factory applications on newer vehicles, especially brake parts.



That orange stuff is Brake Grease. Sounds contrary to common sense but it's to keep the caliper slides from hanging up. I use it on all brake work. So be careful when you tell everybody to grease their brakes, lol. Silicone and Ceramic versions.



Spoon


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[This message has been edited by Spoon (edited 06-16-2022).]

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ArthurPeale
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Report this Post06-16-2022 05:37 PM Click Here to See the Profile for ArthurPealeSend a Private Message to ArthurPealeEdit/Delete MessageReply w/QuoteDirect Link to This Post
what are the cradle bolt sizes? Front, and back.
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Report this Post06-16-2022 06:05 PM Click Here to See the Profile for SpoonSend a Private Message to SpoonEdit/Delete MessageReply w/QuoteDirect Link to This Post
Somebody posted this info years ago.

Rear cradle M12 X 1.75 X 70 mm long for 84-87 and 50 mm long for '88's grade 10.8.

Spoon

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Wichita
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Report this Post06-16-2022 11:58 PM Click Here to See the Profile for WichitaSend a Private Message to WichitaEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Spoon:


That orange stuff is Brake Grease. Sounds contrary to common sense but it's to keep the caliper slides from hanging up. I use it on all brake work. So be careful when you tell everybody to grease their brakes, lol. Silicone and Ceramic versions.



Spoon



It was definitely thread lock compound, because it would be on the caliper mounting bolts, not the slide pins.
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Report this Post06-17-2022 02:01 AM Click Here to See the Profile for ArthurPealeSend a Private Message to ArthurPealeEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Spoon:

Somebody posted this info years ago.

Rear cradle M12 X 1.75 X 70 mm long for 84-87 and 50 mm long for '88's grade 10.8.



And, the front?
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Wichita
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Report this Post06-17-2022 11:56 AM Click Here to See the Profile for WichitaSend a Private Message to WichitaEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by ArthurPeale:


And, the front?


On the parts manual:

https://fieroinfo.com/manuals/


I appears there is two difference sizes depending on the year. It can be M12 X 1.75 X 105 or 200 in length.
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Report this Post06-17-2022 06:30 PM Click Here to See the Profile for SpoonSend a Private Message to SpoonEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Wichita:


It was definitely thread lock compound, because it would be on the caliper mounting bolts, not the slide pins.


Maybe this will help.

https://www.greasemonkeydir...rake-grease-used-for

Spoon

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"Kilgore Trout once wrote a short story which was a dialogue between two pieces of yeast. They were discussing the possible purposes of life as they ate sugar and suffocated in their own excrement. Because of their limited intelligence, they never came close to guessing that they were making champagne." - Kurt Vonnegut

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Wichita
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Report this Post06-18-2022 12:13 AM Click Here to See the Profile for WichitaSend a Private Message to WichitaEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Spoon:


Maybe this will help.

https://www.greasemonkeydir...rake-grease-used-for

Spoon





Thanks for the info. But it is still threadlocker not brake grease.

Go and get brand new caliper mounting bolts, and they come pre-coated with threadlock.



Every GM service guide says this:

"Apply THREADLOCKER, GM P/N 12345493 (Canadian P/N 10953488) or equivalent, to the threads of the brake caliper bracket bolts (2).​"


Thanks,

[This message has been edited by Wichita (edited 06-18-2022).]

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