Brake caliper bolts

leftfootleashed · Jul 23rd, 2015, 22:13

I'm sure I've come across this issue before, and I'm sure I've discussed it on here, but I just can't find it...

One of the bolts on my rear calipers (Girling) is rounded and I want to get some new ones before I go about dragging it out kicking and screaming. You'd think they'd be easy to find given that it's recommended to replace them when you take them off, but no.

Does anyone know the dimensions (length, thread pitch, shoulder)? I pretty sure they're standard so I'll just find some 12.9 high tensile bolts to that spec. They'll be at least as strong as the originals.

geoffo · Jul 27th, 2015, 21:12

but have you tried part number 947327-3 - M10 by 30mm?

leftfootleashed · Jul 27th, 2015, 21:43

Cheers Geoff, will check that out

geoffo · Jul 27th, 2015, 22:45

maybe I should get out more....

mylittletony · Jul 28th, 2015, 08:16

I've just been on a bolt training course where the lecturer maintained that 12.9 were at high risk of hydrogen embrittlement and basically popping the heads off. He was banging on about it so much it's one of the few things that stuck!

the risk is significantly lower with 10.9s, while the strength is still very high and they are widely used in the automotive industry.

In summary, stronger is not always better...

...or just use the Volvo ones!

leftfootleashed · Jul 28th, 2015, 13:15

Hope you at least looked that up Geoff!

Quote:

I've just been on a bolt training course where the lecturer maintained that 12.9 were at high risk of hydrogen embrittlement and basically popping the heads off. He was banging on about it so much it's one of the few things that stuck!

the risk is significantly lower with 10.9s, while the strength is still very high and they are widely used in the automotive industry.

In summary, stronger is not always better...

#

Interesting that...

mylittletony · Jul 28th, 2015, 14:06

Quote:

Originally Posted by leftfootleashed

Interesting that...

let's be honest, it's not...

leftfootleashed · Jul 28th, 2015, 14:19

Would probably get more interesting quickly if doing 60 on a country road and you heard the brake caliper bolt heads pinging into your wheel arches.

I've got to be honest and say I wasn't being sarcastic

Stephen Edwin · Jul 28th, 2015, 16:04

Quote:

Originally Posted by leftfootleashed

Would probably get more interesting quickly if doing 60 on a country road and you heard the brake caliper bolt heads pinging into your wheel arches.

I've got to be honest and say I wasn't being sarcastic

Succinctly put left foot ... and I read both of you as posting in good faith.

Thanks for the very interesting input Tony.

geoffo · Jul 28th, 2015, 22:01

I've got a variety of thread gauges and engineering manuals.......oh nodded off again....

Jul 23rd, 2015, 22:13	#1
leftfootleashed Perma-scarred Knuckles Last Online: Jan 30th, 2024 21:02 Join Date: Mar 2012 Location: Newcastle-upon-Tyne	Brake caliper bolts I'm sure I've come across this issue before, and I'm sure I've discussed it on here, but I just can't find it... One of the bolts on my rear calipers (Girling) is rounded and I want to get some new ones before I go about dragging it out kicking and screaming. You'd think they'd be easy to find given that it's recommended to replace them when you take them off, but no. Does anyone know the dimensions (length, thread pitch, shoulder)? I pretty sure they're standard so I'll just find some 12.9 high tensile bolts to that spec. They'll be at least as strong as the originals. __________________ My car: 2002 V40 1.6 Formerly: 1989 240 GL B200E, estate

Jul 27th, 2015, 21:12	#2
geoffo saving 240's one by one Last Online: Jul 9th, 2024 12:02 Join Date: Jan 2013 Location: Darlo	not sure if this is the right one? but have you tried part number 947327-3 - M10 by 30mm?

Jul 27th, 2015, 21:43	#3
leftfootleashed Perma-scarred Knuckles Last Online: Jan 30th, 2024 21:02 Join Date: Mar 2012 Location: Newcastle-upon-Tyne	Cheers Geoff, will check that out __________________ My car: 2002 V40 1.6 Formerly: 1989 240 GL B200E, estate

Jul 28th, 2015, 08:16	#5
mylittletony Master Member Last Online: Jul 22nd, 2024 08:51 Join Date: Oct 2011 Location: East Sussex	out-geeked I've just been on a bolt training course where the lecturer maintained that 12.9 were at high risk of hydrogen embrittlement and basically popping the heads off. He was banging on about it so much it's one of the few things that stuck! the risk is significantly lower with 10.9s, while the strength is still very high and they are widely used in the automotive industry. In summary, stronger is not always better... ...or just use the Volvo ones!

Jul 28th, 2015, 14:19	#8
leftfootleashed Perma-scarred Knuckles Last Online: Jan 30th, 2024 21:02 Join Date: Mar 2012 Location: Newcastle-upon-Tyne	Would probably get more interesting quickly if doing 60 on a country road and you heard the brake caliper bolt heads pinging into your wheel arches. I've got to be honest and say I wasn't being sarcastic __________________ My car: 2002 V40 1.6 Formerly: 1989 240 GL B200E, estate

Jul 27th, 2015, 22:45	#4
geoffo saving 240's one by one Last Online: Jul 9th, 2024 12:02 Join Date: Jan 2013 Location: Darlo	maybe I should get out more....

Jul 28th, 2015, 22:01	#10
geoffo saving 240's one by one Last Online: Jul 9th, 2024 12:02 Join Date: Jan 2013 Location: Darlo	sadly... I've got a variety of thread gauges and engineering manuals.......oh nodded off again....

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