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  1. #1
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    Hope brake locking on

    Its an M4, anybody got an idea why?

  2. #2
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    ummm, squeezing the lever too hard?

  3. #3
    Meh.
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    System is overfilled?

  4. #4
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    its been fine for about 2 years, so I dont think its overfilled.

  5. #5
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    Is this any use?
    .
    .


    What luck for rulers, that men do not think - Adolf Hitler

  6. #6
    wyrd bi ful rd
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    interesting thread that one ... Steve ... cheers ...

    this got me thinking ... not good ...

    what actually keeps the pistons apart after applying the levers ... i notice they go apart even if stationery ... dont tell me it is atmospheric pressure? as after you release your levers ... the pressure within the system will then push the plunger at the lever end back and this effect will pull the pistons slightly apart???
    Last edited by chinaman; 01-30-2008 at 01:55 PM.

  7. #7
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    The spring in the lever (picture 33 in this thread) pushes the lever piston back to 'neutral', taking the fluid with it (because the system is sealed). That, and the action of the caliper seals basically doing the same thing (returning to neutral) pulls the pistons back into the caliper.
    .
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    What luck for rulers, that men do not think - Adolf Hitler

  8. #8
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    Quote Originally Posted by SteveUK
    ... (picture 33 in this thread) ...
    that is contribution to mankind.

    why is mineral oil not recommended for hope set-ups? no reason why oil would damage any seals.
    Last edited by chinaman; 01-31-2008 at 05:52 AM.

  9. #9
    Meh.
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    Quote Originally Posted by chinaman
    that is contribution to mankind.

    why is mineral oil not recommended for hope set-ups? no reason why oil would damage any seals.
    Same reason you don't put DOT fluid in Shimano/Magura brakes. Different seals are different types of rubber and different durometers. They are designed to work specifically with their respective fluid type.

  10. #10
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    Quote Originally Posted by SteveUK
    Is this any use?
    Cheers Big ears, Love you like a Brother!!

    All fixed.

  11. #11
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    "Cheers Big ears, Love you like a Brother!!"

    That's the way it goes, Big nose!! Glad you're sorted.

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