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LJ brake calipers


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#1 rtorana1

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Posted 06 October 2015 - 11:06 AM

I know that it is not recommended to split the two halves of a brake caliper, but I have a set which have been split. Can anyone tell me what the correct torque is to retighten the bolts of the two halves? I have been told that the torque on the bolts differ to each other (not all the same torque).



#2 _Bomber Watson_

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Posted 06 October 2015 - 12:15 PM

Why is it not recommended?

I will check the shop manual when I get home tonight unless someone beats me to it.

#3 rtorana1

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Posted 06 October 2015 - 01:39 PM

I think its because they are torqued at the factory and the torque required might be very high concidering the forces acting on the two halves under extreme braking.



#4 _Bomber Watson_

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Posted 06 October 2015 - 02:09 PM

I have had them apart and back together many times.

80ft/lb sounds familiar but I will check.

#5 joeseph

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Posted 06 October 2015 - 06:06 PM

I had mine split, and a spacer inserted so they would fit over the correct thickness rotors...

(and yes, they had probably been replaced some years back with the wrong ones)



#6 RallyRed

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Posted 06 October 2015 - 08:56 PM

Ive had them apart to have a looksee at the internal condition of then on my LJ track car. Just tightened them up to whatever the book said with some Loctite to be sure...no dramas experienced since.Sorry but dont remember the Ft Lbs number. Reckon its good to have a look to see how much if any crap is in there if you are going to rely on them .

#7 dattoman

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Posted 06 October 2015 - 09:22 PM

Tight... fkn tight

 

Thats the technical spec



#8 _Bomber Watson_

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Posted 06 October 2015 - 09:23 PM

Just checked multiple different shop manuals, Genuine GM HK, LC, LJ supplement, and a gregories LJ one, none of them listed the torque speck. 

 

Was sure I found it somewhere, but musta just guessed it. 

 

Just get a half decent breaker bar on there and do her up proper. Put a bit of red loctite on the threads. Then go drink beer. 

 

Cheers. 



#9 S pack

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Posted 06 October 2015 - 09:56 PM

Just checked multiple different shop manuals, Genuine GM HK, LC, LJ supplement, and a gregories LJ one, none of them listed the torque speck. 

 

Was sure I found it somewhere, but musta just guessed it. 

 

Just get a half decent breaker bar on there and do her up proper. Put a bit of red loctite on the threads. Then go drink beer. 

 

Cheers. 

DJ, it was discussed in a thread about 4 or 5 years ago. Someone asked the same question.

From memory 70 to 80 ft lb is the general consensus. Same torque for all 4 bolts on each caliper.

I did mine up to 70ft lb and have had no problems or issues.



#10 rtorana1

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Posted 08 October 2015 - 03:04 PM

I recently found some info stating that the standard torque for 3/8" unf bolts is 50 ft lb. Do you thing this is enough as they don't look like high tensile bolts.



#11 S pack

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Posted 08 October 2015 - 05:30 PM

I recently found some info stating that the standard torque for 3/8" unf bolts is 50 ft lb. Do you thing this is enough as they don't look like high tensile bolts.

AFAIK The original bolts are HT.



#12 Bazza

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Posted 08 October 2015 - 05:46 PM

Hi

 

Pehaps the reason for no torque figure given?

 

From the good book :

Attached Files



#13 kiwi-lilj

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Posted 08 October 2015 - 05:55 PM

I rebuilt mine a few years ago and just did them up kin tight. Last time I checked they were still together.

#14 rtorana1

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Posted 08 October 2015 - 06:02 PM

Where did you find that extract Bazza. It's something I saw years ago. So should they be separated or not. What do you think?



#15 _Bomber Watson_

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Posted 08 October 2015 - 07:10 PM

Its in the factory manual TMK. 

Rules are made to be broken. 

 

I doubt when they released the manual they expected people to still be playing with these vehicles 45 years later. 

 

Cheers. 


Edited by Bomber Watson, 08 October 2015 - 07:10 PM.


#16 Bazza

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Posted 08 October 2015 - 07:21 PM

Where did you find that extract Bazza. It's something I saw years ago. So should they be separated or not. What do you think?

 

 

Hi

 

The official LC Workshop Manual. It seems odd that they didn't even want Holden dealership mechanics dividing the part - but as others have said , it appears that it can be done successfully.

 

Cheers

 

Bazza



#17 S pack

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Posted 08 October 2015 - 07:24 PM

Hi

 

Perhaps the reason for no torque figure given?

 

From the good book :

post-257-0-30947300-1444290263.jpg

Learn something new every day.

Which shop manual is that in Bazza?

Don't believe I've seen it in the LC workshop manual.


Cheers

Dave.

 

edit: I'll have to get the good book out and find that paragraph.


Edited by S pack, 08 October 2015 - 07:26 PM.


#18 Bazza

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Posted 08 October 2015 - 07:52 PM

Hi

 

It's under "Disc Brakes" 5C8 at the bottom of the page.

 

Cheers

 

Bazza






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