K2 / Proflex Riders Group

General => Tech Forum => Topic started by: loaded on November 21, 2005, 12:44:39 pm

Title: Proflex 4000 rear brake failure
Post by: loaded on November 21, 2005, 12:44:39 pm

Hey guys,
My 4000 had the left rear alloy brake mount fail after a bit of a spill in the weekend.[smiley=disbelief.gif] [smiley=diaper.gif]

It's the little alloy bit epoxied into the carbon swingarm, with 3 holes for the brake spring.  both the alloy and the epoxy failed.  Has anyone else expereinced this?  Does anyone know where I can get a new mount to epoxy into place?

I know this would be an indeal time to upgrade to disk brakes but as I'm currently starting my own business I'm a little low on $$$$

Any advice would be great!   [smiley=beer.gif]

Pity no one has listed a bunch of evo swingarms on ebay!!!

Title: Re: Proflex 4000 rear brake failure
Post by: rapiddescent on November 21, 2005, 09:24:32 pm

this has happened to a few others over the last 5 years with carbon swingarms.  I think OP & Sprucey have the best knowledge in this area - but involves getting hold opf some epoxy glue and essentially glueing it back in place.

anyone any ideas?

Title: Re: Proflex 4000 rear brake failure
Post by: shovelon on November 22, 2005, 02:10:13 am

Loaded.

You might look for a frameset on Ebay. It may have a decent swingarm. I saw one with an ovaled headtube that went cheap.

Terry

Title: Re: Proflex 4000 rear brake failure
Post by: loaded on November 22, 2005, 10:01:17 am

I think I should be able to repair the damage, I just need a new alloy brake mount.  Does anyone know if these are K2 specific parts or are they a standard part?

Any recommendations for epoxy, I was thinking JB weld or Quick Steel.  

Should I rough up the carbon around the area to give it better bonding strength??

Title: Re: Proflex 4000 rear brake failure
Post by: loaded on November 23, 2005, 09:01:35 am

The official word from the guys at K2 is, and I quote!

"Dang, you'll be needing a new swing arm!"

No little aluminium brake mounts to be had!!  So if I do need a new swing arm should I be able to fit an alloy arm to my 4000?? ;)

Title: Re: Proflex 4000 rear brake failure
Post by: Colin on November 23, 2005, 10:28:18 pm

That'll make it an Evo won't it?
Or a Monkey!

in which case it could become a Disco Monkey with a rear disc!!

Col.

Title: Re: Proflex 4000 rear brake failure
Post by: Simon on November 24, 2005, 06:25:30 am

An aluminium swing arm is a straight swop if you can find one,gives you another option,
will only work on an evo style frame, mods needed for a carbon frame though,
you won't find a weight difference either.
Simon.

Title: Re: Proflex 4000 rear brake failure
Post by: loaded on November 25, 2005, 01:48:18 pm

 ;D
Tried the overkill approach.  Roughed everything up and slathered on sooooo much epoxy that I nearly ended up permanently attached to my ride! :-/

I left it to cure for two days then tested it out a few times before taking it out to the new commonwealth games tracks at lysterfield.  It survived 3 hours of abuse before loosing it in the berms section ::)  which resulted in some impressive, yet unplanned air time.  Hence I'm nursing several bruises and a nicely bent set of riserbars. :-[

So I've learnt a valuable lesson about not making dodgey repairs to brakes!!  So now I'm thinking I need to add a disc ;)

Does anyone have a home made adapter they're not using???
Any hub recomendations??

Title: Re: Proflex 4000 rear brake failure
Post by: Simon on November 25, 2005, 06:49:38 pm

This worth a look for you
http://cgi.ebay.co.uk/K2-Easton-Elite-Frame-not-Orange-Marin-Kona_W0QQitemZ7198626446QQcategoryZ22679QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

disc ready plus a risse shock,

Simon.

Title: Re: Proflex 4000 rear brake failure
Post by: loaded on November 27, 2005, 05:01:53 pm

Thanks for the link Simon, just what I need, but alas too expensive once I convert it into Auzzie dollars!
[smiley=disbelief.gif]
If I do find myself an evo swing arm do I have to worry about what frame it came off?  Or is the swing arm size standard on all the frame sizes?

Cheers,
luke

Title: Re: Proflex 4000 rear brake failure
Post by: Simon on November 28, 2005, 03:54:54 am

Any s/arm from an Evo be it aluminium or carbon will
fit it doesn't matter either if the Evo pivot is bushes
or the later needle bearing pivot the s/arms will still fit,also a carbon arm from an Oz/4500/5500 will fit.
Simon.

Title: Re: Proflex 4000 rear brake failure
Post by: shovelon on November 28, 2005, 04:52:47 am

Simon,

Are you saying that my Evo alum swingarm with the sealed bearings will transfer right onto my Oz? And vice versa?

Terry

Title: Re: Proflex 4000 rear brake failure
Post by: Simon on November 28, 2005, 05:25:58 am

Quote

Simon,

Are you saying that my Evo alum swingarm with the sealed bearings will transfer right onto my Oz? And vice versa?

Terry

Ahh NO,the Evo alum s/arm with the needle bearings in the frame is the same as the Evo s/arm that has bushes,its just the pivot system that changed not the s/arm,BUT the Alum s/arm will fit a carbon only with some major mods,its a clearance issue with the thicker carbon frame body,checkout my gallery for pic's of the mods I had to do to get an Alum s/arm from an Evo to fit my 4500,and that a s/arm that used the frame mounted needle roller bearings.
Simon.