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Help Adjusting / Slipping Maguras Hs33s


DeeZee
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Hiya, I've come to extract more of everyone's lovely brain goo / knowledge. (And yes, I have searched for similar problems)

My problem is the rear Magura HS33 on my Onza T-Rex keeps slipping when I'm trying to tighten it up. So the pad never sits parallel to the rim, its always pointing a little bit in or out. Also one of the cylinders always takes up all the adjustment on the TPA, so I have loads of problems getting both pads to sit an equal distance off the rim.

Is there any fool-proof way of getting the pad to sit dead parallel to the rim? And how can I stop one of the cyclinders being lazy so it takes up all the adjustment? I'm getting sick of the brakes not locking dead tight, the wheel slipping, and me pedal kicking the bike into oblivion, while I land square on my arse :sick:

Thanks

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Got the same problem like you.

Just get good brake pads (koxx bloxx) and set the brake as good as possible.

Than just go have some fun and the blocks will wear parallel to the rim.

At least thats the way i did my brakes.

-san

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I think you'll find that the "Black Crap" AKA "The Poo of Christ" is amazing. Tar saves many trials lives. Ask any Vietnam Veteran, and he'll tell you the same.

But yer, I do find that the sleeve isn't sitting dead true in the clamp.... but thats part of the problem, when tightening up the clamps the sleeve slips with the cylinder.

Come on, Someone must have a good idea how to set up the cylinders parallel without them slipping?

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I think i know what your on about. You get the brake set up just right and you tighten the bolts and it moves. Trez annoying.

What i found is best is to take the clamp to bits, take the black rubbery sleeve out and but i back on the other way round and try again, or just spin it so the clamps are clamping down on a different bit. IPB Image

The reason it moves is becuase it likes to slip back into the groove it made preivously. If you take it off and spin it round, chances are it wont slip back into any past possitions.

As of the lazy pistion, the fullproof way of sorting it out is to undo the tpa right off, and then set the brakes up so that you only need a small amount of tpa on. I'v heard of some people using a 2p coin to get the distence from the rim correct.

The more tpa you have on the worse the lasy piston will be.

Good luck. (Y)

Oh, and for the slippage what pads are you using. If your about to say magura blacks / koolstops. You need to get some new pads befor you even start to think about setting up our brake better.

Edited by JT!
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Do you think the problem may also be that my stock T-rex (spec 1) has a thinish rear rim? Because I have to push the cylinders all the way in, and do a few turns on the TPA before the pads bite in properly.

I'm not sure of standard rim sizes? but I would have thought that I shouldn't have to push the cylinders all the way in.

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Do you think the problem may also be that my stock T-rex (spec 1) has a thinish rear rim? Because I have to push the cylinders all the way in, and do a few turns on the TPA before the pads bite in properly.

I'm not sure of standard rim sizes? but I would have thought that I shouldn't have to push the cylinders all the way in.

That wont help, especially as the pads wear down and you have to wind the TPA in.

I had a mavic d521 on my pitbull and i just couldnt get the maggies in far enough. Gave up and got an onza hog rim instead. Much easier.

As for setting the brakes up, the black plastic sleeves get crushed quite easily, and as JT said, the clamp wants to sit in its original grooves. I bought a new set of sleeves. They are pretty cheap t buy.

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OK, Cheers guys, some good practical advice..... I'm off to find somewhere to buy sleeves from. Or just rotate them.

As for a new rear wheel, well I've knackered the bearings on my hub, so was thinking of getting a whole brand spanking, shiney new rear wheel. I've seen Onza Ronnie Rims, or Hogs.... but I dunno if a hog is perhaps to wide....

Edited by DeeZee
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OK, Cheers guys, some good practical advice..... I'm off to find somewhere to buy sleeves from. Or just rotate them.

As for a new rear wheel, well I've knackered the bearings on my hub, so was thinking of getting a whole brand spanking, shiney new rear wheel. I've seen Onza Ronnie Rims, or Hogs.... but I dunno if a hog is perhaps to wide....

The hog is wide as fook. A ronnie would be fine

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Nah, the piston stays still, The pistons stays clamped, its just when tightening up the clamps, it ALWAYS kicks off so its not dead parallel.

As for the Rim, Cheers for the advice (Y) i'll have a search on the forum for decent stock rims, see what info turns up..... if not, i'll start a short topic on it........ maybe :shifty:

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Easy fix for the crappy sleeves. Get some ptfe tape (or plumbers tape) (click for photo) its very very cheap, get it at most DIY shops like B&Q.

Simply apply a little bit around the thread like bit on the cylinder, and then apply sleeve over it, position the sleeve where you want it, squeeze the sleeve (to 'lock it' into place) and put it back onto the bike, and tighten it up.

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