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Old 2008-09-29, 06:31 AM   #1
412
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Magura HS33 - Squeals like a pig

I've got a KH29 (08) with a Magura brake. Boy is it noisy (I remember this from biketrials but thought that the grind was to blame mostly, turns out that's not the case).

It's so loud it's almost embarrasing to brake when there are people closer than 100m as I'm afraid I'll pop their eardrums or give them a heart attack.

So any thoughts on remedies:
* True rim - did this yesterday (didn't seem to help in my apartment at least)
* Adjust toe in - havn't played with this yet
* Get a booster - thinking of it, will help with frame flex also.
* Wear in the gear, ie ride lots in mud etc - "just riding along" atm :-)
* Change pads - I like the original blacks for this application
* Pour molten led into the frame making it more solid.
* ...?
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Old 2008-09-29, 08:15 AM   #2
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Quote:
Originally Posted by 412 View Post
I've got a KH29 (08) with a Magura brake. Boy is it noisy (I remember this from biketrials but thought that the grind was to blame mostly, turns out that's not the case).

It's so loud it's almost embarrasing to brake when there are people closer than 100m as I'm afraid I'll pop their eardrums or give them a heart attack.

So any thoughts on remedies:
* True rim - did this yesterday (didn't seem to help in my apartment at least)
* Adjust toe in - havn't played with this yet
* Get a booster - thinking of it, will help with frame flex also.
* Wear in the gear, ie ride lots in mud etc - "just riding along" atm :-)
* Change pads - I like the original blacks for this application
* Pour molten led into the frame making it more solid.
* ...?
* Put up with it

Mine on my 29er squeals a bit but not too bad, normaly only at low speeds, at higher speeds its normaly pretty quiet. Normaly with bike trials it is the tar that makes them so load. Dont put tar on a rim if you are only using it as a drag brake, dam its load (but very powerful).

It may get quieter with time. I would just put up wit it.
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Old 2008-09-29, 10:37 AM   #3
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Fixing the toe-in will definately lessen the noise.
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Old 2008-09-29, 11:22 AM   #4
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Old 2008-09-29, 11:37 AM   #5
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Quote:
Originally Posted by goldenchickenIV View Post
Fixing the toe-in will definately lessen the noise.
What the best setup? Toe in, toe out or parallel?
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Old 2008-09-29, 11:56 AM   #6
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magura's official line is that pads should always be parallel to the rim.

I tried toeing in, but it didn't reduce squeal for me.

I've also run grey, black, and funny yellow trials pads at various times. All had a bit of a squeal.

It seems to squeal more or less depending on weather / muddyness.

I think it is slightly quieter once it has worn in a little.

It's quite useful if you're in a busy area - normally unicycles are so quiet that you can come up behind people without them noticing, using the brake is good to let people know you're there.

Joe
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Old 2008-09-29, 12:33 PM   #7
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FWIW, I've run Maguras on my tandem for ages and not had a problem with squeaking. They're HS66, but the caliper end is identical to the HS33 (the 66 was the version with drop bar levers, now sadly discontinued). Normal black pads. I probably toed them in a bit when I set them up just out of habit (just a couple of bits of paper under the back of the block) - I don't remember doing anything special.

But that doesn't really help you... Are you sure everything's tight? A lot of brake vibration problems are down to things being slightly loose or worn pivots (not really applicable to Maguras). Are the rims clean? Try harder compound blocks (but I think the black ones are about the hardest anyway)?

Otherwise, try just riding along with the brake on for a bit to get the pads to bed into the rim nicely - that sometimes helps.

The brake on my coker can sqeal a bit under light braking, especially if it's a bit wet - but I'm sure that's down to it being a cheap bendy BMX caliper.

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Last edited by rob.northcott; 2008-09-29 at 12:34 PM.
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Old 2008-09-29, 12:49 PM   #8
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Quote:
Originally Posted by joemarshall View Post
I think it is slightly quieter once it has worn in a little.
I seem to remember a recommendation somewhere to sand down the pads a little before using them, removing the coating that they get at the factory.
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Old 2008-09-29, 12:52 PM   #9
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Everything is tight, it actually got even worse when i tightened the screws more... go figure. :-P

Lightweigh stuff tends to resonate, but the KH29 is hardly lightweight (well the frame is though which may explain the magnitute of resonance a little bit). I guess wearing in is needed. Btw I spat some water on the pads, that kept is quiet like a mouse for 5-10 meters of downhill...
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Old 2008-09-29, 01:50 PM   #10
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Try to reposition the pads a little higher or lower on the rim. Switch left and right pad. Sing loudly so people won't notice
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Old 2008-09-29, 03:03 PM   #11
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Toe-in should fix it.

The front of the pad should make contact with the rim just before the back of the pad does - this translates to setting the front of the pad about 1mm closer to rim than the back.
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Old 2008-09-29, 05:31 PM   #12
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personally i toe out, if the front of the pad touches the rim first then the front edge will vibrate. Think about pushing a foam block across a table, if you drag it with only the tail end touching it will be fine. But pushing it so the front edge is touching will cause it to grip, deform and then slip, causing vibration.
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Old 2008-09-29, 05:53 PM   #13
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My Maggies squealed when I first put them on my 36er with a powdercoated airfoil rim. I spent an hour sanding them pollishing the breaking surface of the rim to make it nice shiney bare aluminum and presto, no more squeaks.

Does the KH29" rim have machine sidewalls? If it doesen`t I would get rid of all the paint on the breaking surface. It made a world of difrence for me.
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Old 2008-09-29, 08:14 PM   #14
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I had major squeeks with my maggies on my 36. It happened with any rim. I semi-solved it by hot glue gunning sandpaper to the pads; it still let the uni stop, and ground away the powder coating.
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Old 2008-09-29, 09:45 PM   #15
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From Maggie FAQ:

Q - You guys keep bragging that Magura brakes don't squeal. I just fitted new ones and they squeal a bit. Why are you guys lying?

A. Noooooo, we're not lying. Well, maybe a little. My HS-33's squealed somewhat when brand new until the pads wore in a bit. I'd suggest taking sandpaper to them - put the sand paper on a flat surface and rub the pad on it until the factory finish has gone. Also scuff the rim walls with 3M Scotchbrite pads too. Mine have never squealed since. What Maguras don't need is toe-in like V-brakes. Set the pads dead flush to the rims. Remove your tires to really see clearly what you're doing.
Big Dave's additional comment - Another thing that may cause squeal is lack of boosters, air in the lines (not getting full power) and loose bolts.

Hope you find a solution; it's likely my KH29 will have the same problem.
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