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  1. #1
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    Shimano M395 hydro howl/vibration

    Just picked up a 2014 Trek Stache with the subject brakes and the fronts have a vibration and howl unlike anything I've ever felt or heard. Rears are quiet.

    I think that I may have found a cause but I wanted some feedback. It looks as if the front caliper is a little proud of the rotor. The rear caliper embodies its rotor, but the front sits a bit high not making full contact with the pad (pics attached). I tried turning the caliper adapter 180 degrees but it still sits high.

    Could this be the source of the noise and horrible vibration? Any suggestions before I take it back to the shop where I got it?
    Thanks in advance.





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  2. #2
    rebmem rbtm
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    Those cup & cone washers need to be between the bolt head and the caliper, they aren't meant to be between the caliper and the adapter.

    Turn the adapter around the right way, put those washers in the right place and everything will line up properly.

    Correct installation: http://techdocs.shimano.com/media/te...9830667774.PDF

    Were those washers were like that when you bought the bike ?
    If they were then whoever assembled the bike stuffed up.

    * Take the pads out and see if there's an unworn 'step' on the them, if there is sand it down so the pads are flat.

    A couple of threads about the same problem.
    Shimano XT brake pad wear issue
    Why is only 2/3 of my pad surface worn?

  3. #3
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    The washers were like that when I got the bike. I flipped the adapter in hopes that the caliper would sit properly on the rotor. I hope this solves the issue. Thanks a ton for your input!
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  4. #4
    rebmem rbtm
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    You should tell the owner of the bike shop your brake was incorrectly installed, the person who assembled your bike might be doing the same thing to other bikes too.

  5. #5
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    I will. I re-installed everything per the diagram you gave me and the braking feels more positive, but the howl remains. I need to probably sand the pads flat now.
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