K2 / Proflex Riders Group
General => Tech Forum => Topic started by: AndySV1K on April 04, 2008, 04:36:17 pm
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Hi,
Some may have read about me rebuilding my 856 over the last few months and also my tales of magura racelines that needed constant TLC to keep them going. I was concerned that if i reused the maguras on the rebuild, i would end up with the same problem of struggling to keep them airtight.
Well guess what, after a month of running the bike, the front brake is going squishy! if i adjust the flower right in, the lever goes right to the bar.
Its going to need a strip and bleed again.
My question, has anyone ever tried using PTFE on the connections? My concern is whether the mineral oil will affect the PTFE.
I need to do something to keep that fluid in! Its got brand new pipes and connections and i was SO careful when doing the rebuild so as to get all air out and make good connections. its worked ok on the rear as far as i can tell, but the front has failed.
I think i must have a dodgy caliper thread or something.
Andy.
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If you are referring to teflon tape, it should work fine.
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That's a real shame; the HS-11's on my XP-X have been trouble free since brand new in '97 {Gloat}
Hmmm...............That's asking for trouble then isn't it!...............
I have always found the company Magura to be very helpful and I think that there is a user forum on their web site as well .
Maybe you can find some specific assistance there?
Col.
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HS-33's on mine, Had a squishy lever too. It was the piston seal that had failed , and every time I braked a tiny amount of fluid let by. Got it sorted by Magura ( via LBs) for next to nothing. All fine now , as fro the ptfe it will probably be fine.
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Thanks for the replies.
Im pretty sure that its the front calipers that are the problem, they are covered in a mix of black rubber powder and mineral oil! ::)
I probably dont need to call sherlock holmes for this one! ;D
I do need to find a way of stopping my front brake being incontinent though. I think i'll try the PTFE and see how it goes.
Perhaps i should contact Magura and see what they say about it, if they are good to deal with its got to be worth a shot.
Andy.
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Thanks for the replies.
Im pretty sure that its the front calipers that are the problem, they are covered in a mix of black rubber powder and mineral oil! ::)
I probably dont need to call sherlock holmes for this one! ;D
I do need to find a way of stopping my front brake being incontinent though. I think i'll try the PTFE and see how it goes.
Perhaps i should contact Magura and see what they say about it, if they are good to deal with its got to be worth a shot.
Andy.
i wuld say its almost certainly the piston seals a mentioned above.If oil can get out,air can get in.