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 Post subject: Brake fitting
PostPosted: Tue Nov 20, 2012 10:35 am 
Dirt Disciple

Joined: Mon Aug 16, 2010 11:06 pm
Posts: 91
Location: Long Eaton
I'm building up a 531c frame - i'm fitting some Dura Ace BR-7402 single pivot SLR brakes. It appears that when i tighten up the Allen bolt to secure them to the frame it nips the caliper up ie the arms cant clamp and release? Is the boss that holds the caliper release spring threaded? Should I be able to undo the cone headed nut on the front? is the pivot bolt to short and can it be replaced - any guidance please


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 Post subject:
PostPosted: Tue Nov 20, 2012 4:28 pm 
Road Moderator
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Joined: Thu Jun 18, 2009 1:07 pm
Posts: 4715
Location: Sheppey, Kent
Yes thats a single bolt that goes through the center It's likely that a locknut behind the brake arms has come loose so that when you tighten the brake up it tightens everything else too. If you cannot locate the exact problem then inserting a 5mm allen key into the front of the brake when you're doing it up to hold everything in place should do the trick....


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 Post subject: sorted
PostPosted: Wed Nov 21, 2012 10:06 pm 
Dirt Disciple

Joined: Mon Aug 16, 2010 11:06 pm
Posts: 91
Location: Long Eaton
Thanks Tel seems they were not as free as they should have been - wd40 seems to have sorted it :D


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 Post subject:
PostPosted: Thu Nov 22, 2012 4:33 pm 
Retro Guru

Joined: Wed May 27, 2009 10:41 am
Posts: 637
Was having this issue this morning and thought it was just me doing something wrong. I was using modern calipers and was wondering whether it was because the bolts are longer these days due to carbon forks having a deeper cross section than old steel forks?


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 Post subject:
PostPosted: Thu Nov 22, 2012 4:39 pm 
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Joined: Thu Jun 18, 2009 1:07 pm
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The recessed bolts come in different lengths due to frame variations

Image


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 Post subject:
PostPosted: Thu Nov 22, 2012 5:47 pm 
Retro Guru

Joined: Wed May 27, 2009 10:41 am
Posts: 637
Ah, will have to try and get a smaller size then seems a better idea than arming myself with a hacksaw...


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