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Need help fixing brakes on trials bike.

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Need help fixing brakes on trials bike.

Unread postAuthor: SpudFarm » Fri Oct 01, 2010 4:32 pm

Got a new trials bike about 5minutes ago, cost me 1500bucks and I was excited to test it. The joy was shortlived as the brake mount broke while in normal use.

The brakes on the bike is magura hs33 (Hydraulic rim brakes) and parts for those are VERY hard to get in Norway.. I thought that the genious forum called Spudfiles might be able to help.

So, since this is hydraulic brakes there are pistons and gaskets inside the mounts. This is a puta since it could be welded if not.

I'll just give you a million pictures to choke upon before writing more:

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I have no idea how to fix this, it is a tall task even for epoxy..

Please help, thanks.
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Unread postAuthor: whoa044 » Fri Oct 01, 2010 5:02 pm

The brake mount? Do you mean the part that has the brake lever connected? The brake mount is what holds the calipers to the frame.

Please don't weld it. If you hadn't known, the metals used in making bike parts are for the light weight, not strength (it depends what kind of bike you have, but brake levers don't matter). You pretty much have no choice except to buy a replacement part.
Welding will never do. I gurantee you it won't work if you try it. If you do, it'll look ugly, and will not have any strength. Unless if you have a TIG welder, then it's different.

Out of curiosity, what kind of bike do you have?
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Unread postAuthor: SpudFarm » Fri Oct 01, 2010 5:15 pm

Unless if you have a TIG welder, then it's different.

The beuty is - I do :) It broke between the brake lever and the handlebar.

The mount is basicly housing a hydraulic pump so I can't weld it, not even with the TIG..
Perhaps cast the thing inside a Epoxy block..

I'll upload a picture of the bike tomorrow.
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Unread postAuthor: Ragnarok » Fri Oct 01, 2010 8:46 pm

Obvious question: Where did you get it from? Is there any kind of warranty that covers this?

If you've bought it second hand, then you're probably ronnied as far as that angle, but it doesn't hurt for me to ask.
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Unread postAuthor: Fnord » Sat Oct 02, 2010 10:03 am

Other Obvious question: Do you still talk to larda?

:D

But really, if you can't find a replacement in your own country maybe you could talk to someone nearby about shipping one to you.
It looks like it'll be tricky to weld, and given the stress it's under I'd be hesitant to fiberglass it.
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Unread postAuthor: inonickname » Sat Oct 02, 2010 10:15 am

I'd really consider looking at getting one shipped in. You don't want brakes to stop working at the wrong time.

If I had to do something about it, I'd use a good quality silver solder, or braze it. Doesn't seem too suitable for welding.
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Unread postAuthor: SpudFarm » Sat Oct 02, 2010 10:21 am

The bike was bought second hand, the seller is looking for a replacement aswell.

I don't think Larda could make a part like this..

I am looking thoughout the web for a person that can sell me one, I still havent found one..
If I can't find a replacement I'm pretty stuck, I do have hopes though. I have found someone in Norway that sells Magura disk brakes and parts for those, I will Email them. I might be lucky!

If I had to do something about it, I'd use a good quality silver solder, or braze it. Doesn't seem too suitable for welding.


It still have hydraulics in it.

Edit: I found a supplier of complete brakes. They might be willing to sell me just the lever and mount.
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Unread postAuthor: inonickname » Sat Oct 02, 2010 11:35 am

Can you disassemble and remove any plastic/rubber in it? If not, you can make a heat sink out of a large chunk of wet modelling clay and use it to protect the stuff you don't want to get hot. You'll still need to move fairly quickly, but it shouldn't be a big problem.
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Unread postAuthor: SpudFarm » Sat Oct 02, 2010 5:58 pm

I'm afraid that welding and eventual soldering will cause the metal to warp. That will probably cause it not to seal.

However, the seller told me he have found someone that might be able to get me one. That combined with the webshop I found that trade complete brakes will probably cause it all to fall in place :)
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Unread postAuthor: SpudFarm » Tue Oct 05, 2010 9:51 am

Just wanted to bump this up to tell other Magura HS33 users what I just experienced.

The guy who sold me the bike managed to get his hands on a new mount, it was 231USD and that kind of shocked me because complete brakes cost 154USD in Norway.
Might be worth checking if you ever need one as this seems to be a common problem with those brakes.

Edit: Forgot to upload pictures of the bike.
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Unread postAuthor: jackssmirkingrevenge » Tue Oct 05, 2010 10:00 am

Nice ride! You know I would have attempted the repair with good epoxy and a suitable binding material...

However:
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Unread postAuthor: POLAND_SPUD » Tue Oct 05, 2010 10:42 am

lol lol lol

anyway... you know that bicycle cable brakes can be use for actuating valves from distance?
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Unread postAuthor: whoa044 » Tue Oct 05, 2010 2:13 pm

You might get away with TIG welding, but that's where the hydraulic resovoir is, so I wouldn't risk it. Epoxy + Clamp, should do the trick

Stumpjumer fsr 29 for the win
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Unread postAuthor: SpudFarm » Sun Oct 10, 2010 11:13 am

HAHA! That made my day JSR!

You do realize that jesus' cave actually is my bottom? I haven't told anyone before now so try to keep it down.

I have to say though, how do you come up with this stuff? :P


anyway... you know that bicycle cable brakes can be use for actuating valves from distance?


Never thought about that but it sounds interesting.

I have a new handle now, just need to remove the air from the system and it's ready.

Reason I reply so slow: Never thought anyone would post so I didn't mind checking.
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