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Home > Help Needed / General Tech Chat > 7.5 calliper bolts.

Yo-Han

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North of the Netherlands

6th Mar, 2013 at 08:40:31pm

Can somebody please comment?

I pulled my 7.5 brakes appart and also split the calipers.
Found the bolts holding the parts together to be quite short:



Is this normal / as should be?

Thx,
Han

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WRLondon

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Surrey

6th Mar, 2013 at 08:46:01pm

should be abit longer than that fella!
that would be for peace of mind as you dont want one of those failing under heavy braking

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mercenary62

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somewhereintheuniverse near selkirk scotland

6th Mar, 2013 at 08:50:36pm

yep a bit short fella order some new ones

give em hell

Yo-Han

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North of the Netherlands

6th Mar, 2013 at 09:22:51pm

Cheers guys.
I was quite convinced myself these were short.
Had a quick look at MS but could not find these.
Can somebody comment on specs of these bolts; iirc these have had a special treatment.

Han

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graemec

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Carnforth, Lancs

6th Mar, 2013 at 09:32:54pm

These are the kiddies:
http://www.minispares.com/product/Classic/...k%20to%20search


fastcarl

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leeds/wakefield.

6th Mar, 2013 at 10:30:35pm

they are an exoensive option,


my advice is to take a sample to your local nut bolt shop and try get them in socket head cap acrew, i think the thread is 3/8unf, possibly 7/16 unf

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Yo-Han

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North of the Netherlands

7th Mar, 2013 at 11:16:22am

Cheers guys,
Expensive indeed; there is a Fabory close by so I will try Carls advice.
Any comment on the bolts having had a special treatment or should I just try to get some hardened bolts?

Han

Dazed and Confused....

Rod S

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Rural Suffolk

7th Mar, 2013 at 01:16:51pm

You should just need high tensile, grade 8.8 or above.

Cap heads (as Carl suggests) will normally be greater than 8.8, often 10.9 or higher.

The heat treatment and actual alloy "ingredients" is what gives the strength rating.

Rule of thumb on length of thread engagement is 1.25 the diameter as an absolute minimum.

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Yo-Han

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North of the Netherlands

7th Mar, 2013 at 02:21:00pm

Thanks Rod,
With hardened I ment high tensile.
Will see what local shop comes up with.

Han

Dazed and Confused....

graemec

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Carnforth, Lancs

7th Mar, 2013 at 07:51:53pm

They're not that cheap, but at least they include the correct seal which doesn't come in the caliper rebuild kit.
The seal is available separately though.


nala56

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Sheffield South Yorkshire GB.

7th Mar, 2013 at 08:20:54pm

that's my view you need the seals, will have been a long time compressed so will need to be replaced

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