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 Post subject: disc brake hose mounts
PostPosted: Sun Sep 05, 2010 10:15 am 
Old School Grand Master
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Joined: Mon Jun 14, 2010 9:06 pm
Posts: 4431
Location: Herts UK
Older forks and frames do not have mounts for disc brake hoses and although there may be gubbins thatr can be bought, I was using strips cut from plastic bottles held to the brake boss via a bolt. It worked but well, looked like strips cut from plastic bottles held to the brake boss via a bolt.

So having some 3/16 hose clips, as used for car brake pipes, thought I'd make something nicer looking and lighter.

Forks tend to have M8 thread for the brake bosses that are removed. I put on a short length of M8 thread onto an 8mm aluminium rod from B&Q and cut it a couple mm above the thread - the unthreaded part to stop the plug from screwing all the way in. I drilled and tapped M4 and finally a saw cut to act as a screwdriver slot (I hack saw bladed is used to screw the plug in).

first photo shows the plug - the M4 hole is offcentre since I do not have a lathe and next photo shows it fitted.


Image

Image

The rear brake bosses are tapped to some fine possible non metric thread, larger than M8 so I could not make a plug from aluminium.

I have strip of plastic and made a T-shaped plug, drilled to take a self tapper. Photo shows home made cutters. Some fetting with a file was needed. For the second of these plugs, I used a hacksaw to put some thread - very crude but worked well enough to allow t he plug to be screwed in. Left hand shows previous mount - cut down brake boss, plastic bottle strip and bolt - right hand shows the plug, clip and tools to make it.

Last photo shows the plug fitted.

Image

Image :idea:


Last edited by 02gf74 on Mon Sep 06, 2010 10:07 am, edited 1 time in total.

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 Post subject:
PostPosted: Sun Sep 05, 2010 11:17 am 
retrobike rider / Gold Trader
retrobike rider / Gold Trader
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Joined: Thu Jan 07, 2010 12:23 pm
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Location: Cumbria
That's some good advise there, very useful.


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 Post subject:
PostPosted: Sun Sep 05, 2010 11:37 pm 
Retro Guru
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Joined: Thu Sep 11, 2008 4:36 pm
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Location: West Sussex.
Great work! :) Ive been thinking about doing something like this myself.

Probolt make anodised aluminium p-clip's in various sizes by the way.

Image

Heres a link - http://www.tastynuts.com/Products/Aluminium_P_Clips


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PostPosted: Mon Sep 06, 2010 7:43 am 
Retro Guru
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Joined: Tue Aug 07, 2007 12:22 pm
Posts: 2942
Location: Platsa, Messinias, Greece
02gf74 wrote:
.

Forks tend to have M5 thread for the brake bosses that are removed.

I've never seen brake bosses with a fixing as small as M5 - some Marzocchis use M6
02gf74 wrote:
.
I put on a short length of M5 thread onto an 8mm aluminium rod from B&Q and cut it a couple mm above the thread - the unthreaded part to stop the plug from screwing all the way in.


I guess that you meant that you threaded an 8mm bar M8, not M5?

02gf74 wrote:
.
The rear brake bosses are tapped to some fine possible non metric thread, larger than M8 so I could not make a plug from aluminium.


M10 x 1mm - same as rear mech. hanger thread and Shimano wheel spindles etc.
Looks tidy enough once its all done though..... 8)


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 Post subject:
PostPosted: Mon Sep 06, 2010 10:10 am 
Old School Grand Master
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Location: Herts UK
^^^ well spotted - it is M8 in forks - putting M5 onto 8 mm rod is gonna take some doing - corrected the post.

re: rear, at leas on Gary Fisher frame - it could be M10 but is not the standard M10 thread - looks too fine - I didn't try to fit an M10 bolt to check since it looked too fine plus I do not have any 10 mm bar to make the same type of plug.


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 Post subject:
PostPosted: Mon Sep 06, 2010 10:18 am 
Retro Guru
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Joined: Tue Aug 07, 2007 12:22 pm
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Location: Platsa, Messinias, Greece
02gf74 wrote:
^^^ well spotted - it is M8 in forks - putting M5 onto 8 mm rod is gonna take some doing - corrected the post.

re: rear, at leas on Gary Fisher frame - it could be M10 but is not the standard M10 thread - looks too fine - I didn't try to fit an M10 bolt to check since it looked too fine plus I do not have any 10 mm bar to make the same type of plug.


"Standard" M10 thread is 10 x 1.25mm pitch.


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