Disk brakes not releasing

Discussion in 'Mountain Bikes' started by Venom, Jul 29, 2014.

  1. Venom

    Venom New Member

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    Hello, I am new to the forums and I am in need of some help. I recently bought a Trek 3900 and I noticed that the disk brakes don't grab very good, they are in fact fairly bad. The bicycle is used. I tried adjusting the mechanism so grabs tighter, no change. I then began to get frustrated, I took out the brake pads, they looked kind of smooth. But when I began to put the brake pads back in, I noticed a small cylinder shaped magnet (this magnet was also there when I took apart the assembly). Now I can't find out where this magnet goes.
    [​IMG]
    It won't sit in the center of the brake pad because the magnet repels, therefore, sliding to the side.
    [​IMG]
    If I let the magnet sit on the side, the brake pad grabs only on a specific side of the disk, therefore damaging it.
    [​IMG]
    Now every time I brake, the brake won't return unless I stop and roll the wheel the opposite way, or manually pull the clamp back. I even tried adjusting the spacing of the pads and all, but I was not successful.

    All help is greatly appreciated!
     
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  2. alfeng

    alfeng Well-Known Member

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    FWIW. Typically, on a MECHANICAL (bicycle) disc brake caliper, only ONE side/(pad) moves ... I do NOT know what the particulars are of your bike's brake calipers ...
    When in doubt, throw it out.​
     
  3. lectraplayer

    lectraplayer Member

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    Also, check your cable pull, and use plenty of moly on that cable.
     
  4. graham66

    graham66 New Member

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    twat it with a hammer
     
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