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Old 01-17-2020, 03:47 AM   #1
petiww
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Default Girling caliper tightening torques

Hello!

So I'm doing the brakes on the beater 244 and i disassembled the caliper halves to properly wirebrush and clean the bores. I need proper tightening torques for the bolts.

All bolts have 24 TPI, their diameters are 5/16 and 3/8, which makes them UNF bolts.
Bolt heads have british X marking which i believe makes them about 12.9 in metric.
( https://www.fastenerdata.co.uk/fastener-grades )

Any help would be appreciated!
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Old 01-17-2020, 04:45 AM   #2
c1800
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Google gives a number of articles,

Here’s one

http://etype.chrisvine.com/2013/06/b...liper-rebuild/

Govern yourself accordingly.
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Old 01-17-2020, 07:15 AM   #3
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Quote:
Originally Posted by c1800 View Post
Google gives a number of articles,

Here’s one

http://etype.chrisvine.com/2013/06/b...liper-rebuild/

Govern yourself accordingly.
Thanks!

Using that site 3/8" bolt needs 55Nm, 5/16" bolt needs about 32Nm.

Yesterday night after some thinking I used 50Nm on the big bolts, 30Nm on the small bolts, so im not that far off. Good thing i can retorque them any time when its on the car.
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Old 01-17-2020, 09:50 AM   #4
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Always carried this notion these bolts were torque-to-yield. I don't know where I obtained that notion, so I don't want to begin another myth.

But as yet I've not ventured to rebuild a caliper once split, or obtain the seals or bolts. I've since seen the seals for sale, but I've not ordered them. I would do it, but only on a car I drive exclusively myself, so I can keep a close eye, and that one is not in need of caliper work.

Yes, trying to do the minimal rebuild (piston seals and dust boots) is a pita with the calipers un-split.

http://cleanflametrap.com/v79_4792.jpg

http://cleanflametrap.com/calipers/
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Old 01-17-2020, 01:37 PM   #5
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Just for giggles i once split a caliper to rebuild it. No matter how much I torqued the bolts the thing leaked. Not sure where I went wrong. Beware.
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Old 01-17-2020, 02:08 PM   #6
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Did you change the transfer port seals? Volvo doesn't want you to split the caliper halves so they never sold them.

They are only available through the aftermarket.

https://xks.com/i-6918452-jaguar-fro...tegory:1207221

http://www.vp-autoparts.com/us/main....le&artno=S7428
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Old 01-19-2020, 09:49 AM   #7
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Quote:
Originally Posted by cleanflametrap View Post
Always carried this notion these bolts were torque-to-yield. I don't know where I obtained that notion, so I don't want to begin another myth.

But as yet I've not ventured to rebuild a caliper once split, or obtain the seals or bolts. I've since seen the seals for sale, but I've not ordered them. I would do it, but only on a car I drive exclusively myself, so I can keep a close eye, and that one is not in need of caliper work.

Yes, trying to do the minimal rebuild (piston seals and dust boots) is a pita with the calipers un-split.

http://cleanflametrap.com/v79_4792.jpg

http://cleanflametrap.com/calipers/
Quote:
Originally Posted by nel621 View Post
Just for giggles i once split a caliper to rebuild it. No matter how much I torqued the bolts the thing leaked. Not sure where I went wrong. Beware.
I had all my calipers sandblasted then split on brownie. I had them zinc plated, then assembled it with new dust shields and new piston square seals. I found all 6 transfer seals rubbery enough, so they were reused and leakfree since then.
I did not have a torque wrench back then so i went with what i felt like good enough. More torque wont help with leaking though.
DSC_0020
Sourced good enough used pistons for these... Greased the heck out of them.

Once i found a transfer seal like this, from a working car.....
2016-10-10-2573

I seen new transfer seals in the rebuild kits though, but they had smaller outer diameter than the recess in the halves, and that would be worse than reusing old ones imo.
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Old 01-19-2020, 10:52 AM   #8
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Beautiful!

Regarding re-using the seals, I thought I might do that as well, after measuring them.



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yes, image resizing is something that is built in correctly with vb4. No need to remind me, this is DEFINITELY something on my list of 'must have working properly'.
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