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Magura HS33 - Squeals like a pig

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  • #16
    Originally posted by hansc View Post
    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.
    Yea that sounds about right, mine are now worn in and like perfectly flush and mine are silent, rode with them yesterday, not a sound.
    Marcus Collings
    *)---', 1mHighJump*
    my pure trials vid
    my Year in vid
    learning 180 or 360 unispins? watch my unispin tutorial
    Want to glide? watch my ww tutorial

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    • #17
      I decided to grab the pig by the b****, so no half measures this time.

      I've:
      * Sanded the rim (it had a very rough surface with tracks in it and a nasty weld join which caused thumps every revolution). If i where to guess the 08 rim is to blame (the 07 version is nice and smooth)
      * Sanded the pads (most likely not the culprit, but got rid of rims imprinted "tracks")
      * Rebuit the whole wheel (stock build was off center and out of true)

      I'll:
      * Get a brake booster
      * Adjust the pads more precisely

      And if that doesn't solve it I'll just live with it - hopefully I'll get my booster this week so I can give it a try. (I won't check what did what but report on the final result.)

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      • #18
        I had the same problem!! And I know the feeling of people turning around thinking it's a firetruck with a major emergency!!

        I used normal chain oil to lube it but it only last for about 60km then it squals again....
        www.unicycle.co.za


        "There is no KNOWLEDGE that has no POWER" - Mortal Kombat.

        "Of All The Things I've Lost, I Miss My Mind The Most"

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        • #19
          Hey,

          My brakes usually squeal when aluminum oxide from the brake surface has gotten into the pads. For me, cleaning pads and the rim with a degreaser like Simple Green, and perhaps lightly sanding the pads, does the trick.

          Kris

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          • #20
            After saying how quiet mine were, they have now started to squeal realy badly. I think it was after they got damp in the rain yesterday. They have goten wet many times before and stayed quit though, weird.

            Originally posted by danger_uni View Post
            Hey,

            My brakes usually squeal when aluminum oxide from the brake surface has gotten into the pads. For me, cleaning pads and the rim with a degreaser like Simple Green, and perhaps lightly sanding the pads, does the trick.

            Kris
            I think I may try that, although everyone stares anyway, why not tell them you have brakes by making a little noise?
            Marcus Collings
            *)---', 1mHighJump*
            my pure trials vid
            my Year in vid
            learning 180 or 360 unispins? watch my unispin tutorial
            Want to glide? watch my ww tutorial

            Comment


            • #21
              Pleeeeeease dear mailman give me my booster today so I can try it out during the weekend. :-)

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              • #22
                Originally posted by 412 View Post
                Pleeeeeease dear mailman give me my booster today so I can try it out during the weekend. :-)
                Let us know what difference it makes. I will be suprissed if it makes much difference, but it may. The KH29 frame is amazingly stiff, compared to my brothers bike, there is no flex in the frame at the breaks. My brothers bike frame flexes loads, my 07 KH29 doesnt look/feel like it flexes at all.

                Although saying that, when I adjusted my breaks so they were only just off the rim, I think I got them to touch as I pulled away.
                Last edited by sp4rky-m4rky; 2008-10-10, 08:21 AM.
                Marcus Collings
                *)---', 1mHighJump*
                my pure trials vid
                my Year in vid
                learning 180 or 360 unispins? watch my unispin tutorial
                Want to glide? watch my ww tutorial

                Comment


                • #23
                  Originally posted by sp4rky-m4rky View Post
                  Let us know what difference it makes. I will be suprissed if it makes much difference, but it may. The KH29 frame is amazingly stiff, compared to my brothers bike, there is no flex in the frame at the breaks. My brothers bike frame flexes loads, my 07 KH29 doesnt look/feel like it flexes at all.

                  Although saying that, when I adjusted my breaks so they were only just off the rim, I think I got them to touch as I pulled away.
                  I put everything together during the friday, but there was no motivation to ride because of constant raining... :-(

                  From just goofing around in my apartment it seems that:
                  * Frame flex almost nonexistent (<1mm, can't see any) now (before it flexed about 3mm on each side if I squeezed the lever firmly). So whilst the KH is stiff the Maguras put lots of stress on any frame (even 2wheel trials frames use boosters and they are designed for a sport in which you really need a lot of braking power...) You really hear the distintive clunk now when the pads contact the rim and the the lever will not budge any more. I expect the feel to have improved and the noise to have gotten more dull, as this is what happens on trials bikes.
                  * The horrible squealing has subsided, but I'll not assume it's gone until the pads are worn in to then new adjustment...
                  * Sanding the rim seems to have made the biggest improvement, but since I did all at once I can't verify this.

                  I'll report back once I've gone for a proper ride. I'll try and post a pic also, the booster looks really nice on!
                  Last edited by 412; 2008-10-13, 05:53 AM.

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                  • #24
                    mine don't make any noise - they are sitting in a box- I don't miss them.
                    Last edited by critter; 2008-10-13, 06:20 AM. Reason: spelling
                    MUni! The closest I'll ever get to bull riding!

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                    • #25
                      Update with pics. Haven't ridden anything this week due to constant raining, but hopefully will ride a bit during the weekend.
                      Attached Files

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                      • #26
                        Wow, that looks like a beast of a brake. Do you know how much the booster weights?

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                        • #27
                          52g according to the manufacturer (without bolts). This is one of the lightest boosters on the market (possibly even the lightest stock?). I would say weight is not an issue though, I was mostly curious to test a superlight 2bolt booster, having used what is probably the buffest 4bolt booster on the market on my trials bike way back when...

                          Anyway it seems to do the job good enough. (I'll "field test" it properly today.) The main caveat is the price, is cost me more that half of what the hs33's cost me.

                          This is probably a better option in reality:

                          Same high price tag though.

                          I guess for half the money this one would be my recommendation, it's thrice the weight though (but that won't matter) . :-)

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                          • #28
                            To clarify, this is not the first resort when it comes to silencing a loud brake... it choose to add a booster cause I also wanted to elminate to spongy lever feel. However the brake works perfectly fine without, as picky is not a nice work I'll go so far as to call myself a connoisseur instead. :-P

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                            • #29
                              I just installed an HS33 on my KH24. No squealing so far, but from the world of biking, playing with toe-out and toe-in and sanding the pads and perhaps the rim are the best solutions. One of those has to work.

                              I just got my KH24, and got a 2007 when I thought I was ordering a 2008. I was curious about the comment about the better rim on the 07 KH29 and wonder if it also applies to the KH24 rim. As I'm still a bit of an idiot, I apparently have to talk myself into being happy with the 2007 thing. But even if not, yesterday's ride (my first on it) was very helpful toward solving this (internal) problem!
                              .
                              .
                              .
                              .
                              Rockin' the Wasatch with a hand on my crotch.

                              (Thanks, Magura; thanks, Beck.)

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                              • #30
                                Originally posted by JesseG View Post
                                As I'm still a bit of an idiot, I apparently have to talk myself into being happy with the 2007 thing. But even if not, yesterday's ride (my first on it) was very helpful toward solving this (internal) problem!
                                Haha, I knew I am an idiot so I bought the 08 instead. :-)

                                The main motivations for the 08 are adjustability in height on the frame. Also the new seatpost is very nice and with the brake adapter the lever comes closer to the handle which is nice.

                                The tyre is VERY nice also. Other then that the upgrades are very small, like shaving a few grams of the rim. The pedals are also very nice, but seems to have zero durability. They are made of cheese and painted with water based paint it seems.

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