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  1. #1
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    problem centering Planet X brakes

    Hi all,

    Yesterday I installed a set of Planet X brakes (Planet X Ultra Light CNC Brake Calipers) on my bike and just couldn't center them no matter what I did. One arm was always touching the rim. If anyone has any experience with these brakes and could give some tips, it would be greatly appreciated.

    Thanks

  2. #2
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    Step one is to oil the point where the springs touch the arms. There's always a bit of slippage as the brakes open and close, so you want to make sure both slide easily.

    Then you're probably making the common mistake of centering based on the closed position. Don't. Instead loosen the mounting bolt, center the brake while open, and hold it there while you tighten. You may hold it using a hex key through the front of the center bolt if you want.

    Also, make sure there's good mating surface between the brake bolt and the fork or rear bridge. Some forks have curver faces and call for a matching washer, and some rear bridges have very little mating surface. If you center the brakes and they move later, you can improving things by making a donut (like a loose leaf reinforcement) out of a piece of adhesive sandpaper (medium grit) and sticking it to brake bolt, so it's between the brake and frame or fork. This will bite when tightened and prevent any movement without needing to overtighten.
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  3. #3
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    These are single pivot brakes and always more difficult to center and keep centered than dual pivots. See if there are wrench flats on the mounting bolt behind the caliper arms. A cone wrench can be used on these flats to center the brakes and keep them in place while you tighten the mounting nut.

  4. #4
    coprolite fietsbob's Avatar
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    No image of the center Bolt, per se .. dont own that brake.

    along the same lines of the above Post,

    With My Old Campag single pivot's, the Center bolt has flats for a wrench behind the return spring
    to hold the brake while I tighten the nut that holds it on the frame.

    perhaps the allen hex socket in the front serves that function?
    Last edited by fietsbob; 05-27-14 at 10:47 AM.

  5. #5
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    Quote Originally Posted by fietsbob View Post
    With My Old Campag single pivot's, the Center bolt has flats for a wrench behind the return spring
    to hold the brake while I tighten the nut that holds it on the frame.
    Yes, that was the right way to center these brakes. I had to use a wrench to hold the brake and then it was rather easy to center them.

    Thanks for all the replies!

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