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  1. #1
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    Why is only 2/3 of my pad surface worn?

    I bought a used bike and noticed that the front wheel does not spin freely. I did not really notice it while test riding it but it clearly rubs during a small part of the rotation so I pulled the pads out to see if I could figure out why.

    Pictured below, is this common? How do I fix it? It looks like I'm only getting about 60-70% of the braking power I could be getting with full contact. You can also see on the rotor that there is more wear at the outside of the ring.

    This is from a 2011 Trek Superfly 100 with Shimano XT M775 brakes.


    Why is only 2/3 of my pad surface worn?-img_1793.jpg

    Why is only 2/3 of my pad surface worn?-img_1792.jpg

  2. #2
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    Re: Why is only 2/3 of my pad surface worn?

    There's a washer between the caliper adapter and the brake posts. Try removing it since those generally are not mounted with shimano brakes. Make sure that the rotor clears the caliper and spins freely afterwards

  3. #3
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    Why is only 2/3 of my pad surface worn?

    Quote Originally Posted by Alias530 View Post
    I bought a used bike and noticed that the front wheel does not spin freely. I did not really notice it while test riding it but it clearly rubs during a small part of the rotation so I pulled the pads out to see if I could figure out why.

    Pictured below, is this common? How do I fix it? It looks like I'm only getting about 60-70% of the braking power I could be getting with full contact. You can also see on the rotor that there is more wear at the outside of the ring.

    This is from a 2011 Trek Superfly 100 with Shimano XT M775 brakes.


    Click image for larger version. 

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    Click image for larger version. 

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    You have a spacer between the caliper and post mount.
    Remove it!
    Install new pads.
    mtbtires.com
    The trouble with common sense is it is no longer common

  4. #4
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    Thanks so much to both of you!!

    Why is it there to begin with? I looked in the rear and there's 1 big washer and 2 little washers on one side and the other side has just 1 big washer. The front has 1 little washer on one side (pictured) and no washers on the other. I looked at my bike (2013 model of the same bike) and neither side had any washers. Why would someone put a washer there?

  5. #5
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    Washer has to be installed on top of the brake caliper with Shimano. Check the tech documents - same question has been answered only a few weeks ago in another thread.

  6. #6
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    Quote Originally Posted by madskatingcow View Post
    Washer has to be installed on top of the brake caliper with Shimano. Check the tech documents - same question has been answered only a few weeks ago in another thread.
    It says online that this bike came with SRAM drivetrain and Avid brakes, but now it has Shimano drivetrain and brakes. I'm guessing the prior owner just installed it wrong.

  7. #7
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    Here is your thread

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