Quick stupid question  RSS Feed

#1 2013-01-31 8:55pm

Kvon
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Quick stupid question

Talking Dia Comp MX 1000 era and type calipers: What is the difference between a front brake and a rear brake?  Is it just the post mount length? Can I buy a front caliper on ebay, use it for a rear brake and just cut the mounting bolt?  I know that with levers you want right and left correct or they will be upside down... I just wondered about calipers.
Thanks! smile

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#2 2013-01-31 8:56pm

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Re: Quick stupid question

You would need an entire pivot bolt. You canst just cut it.


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#3 2013-01-31 8:57pm

Iceman
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Re: Quick stupid question

Yes and no.


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#4 2013-01-31 9:03pm

Johnnny
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Re: Quick stupid question

if it's a rear you want a rear, otherwise like Owl said you need to replace the bolt to run a bunch of spacers plus the adjuster can be wrong depending on the model of brake.

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#5 2013-02-01 11:14am

esw
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Re: Quick stupid question

It's possible to cut and rethead the bolt, but some will discourage that. The pivot bolt is much longer on a front to go all the way through the mounting hole is a fork. Most rear mounts are a small tube or a flat plate therefore the bolt is shorter. There are other differences on some brakes as others have noted above.


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#6 2013-02-01 12:04pm

changachump
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Re: Quick stupid question

Also if the front brake was set up for Potts mod, the Weinman adjuster
and cable stop bolt/quick release may be altered or removed altogether.


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#7 2013-02-01 2:45pm

Darkman
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Re: Quick stupid question

I've used front brakes on the rear tons of times. works better than trying to use rear brakes on the front. Looks stupid with 100 washers but it'll stop you, Beats going without brakes... IMO your best bet is to take the rear post out of some shitty no name caliper and just rebuild the good one.


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#8 2013-02-01 10:43pm

Kvon
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Re: Quick stupid question

Great information and perspective everyone. Thank you.  Is the geometry of the caliper arms any different between front and rear? Depth adjustment on the pads longer?  Off hand... does anyone know what the standard front and rear pivot bolt length is (was/should be) on an '84 MX1000?
Thanks again. smile

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#9 2013-02-03 7:16am

SKYWAYNE1026
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Re: Quick stupid question

Kvon wrote:

Great information and perspective everyone. Thank you.  Is the geometry of the caliper arms any different between front and rear? Depth adjustment on the pads longer?  Off hand... does anyone know what the standard front and rear pivot bolt length is (was/should be) on an '84 MX1000?
Thanks again. smile

No difference in the arms and if you're not concerned about era correct parts I believe Porkchop sells the new Dia-Compe pivot bolts on his site they should work fine.
Also in the past I have had good luck re-threading then cutting off the excess especially for use on flat brake bridges like Hutch I would take an old even bent DC front then clean & polish it up, thread it almost all the way down mount it for size reference then cut it to the proper length. I hate looking at all those washers and spacers people use, just don't do this to an OG rear bolt they are hard to find and always in demand so an old front is the best bet.


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