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  1. #1
    Senior Member Ziemas's Avatar
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    Avid BB7 Disc Brake Only Works When Wet- Suggestions Please!

    Here's a strange one. When conditions are dry my front Avid BB7 disc brake will not stop me. It's so bad that I can pull the leaver, push the bike and the front wheel will move a little. But when it's wet out and the brake is wet it works perfectly. I have new Avid pads and have cleaned the rotor. The brake is properly adjusted. The rear brake has no problems.

    Do you have any idea what could be causing this and how I can solve it? Thanks.

  2. #2
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    Quote Originally Posted by Ziemas
    The brake is properly adjusted.

    Do you have any idea what could be causing this and how I can solve it? Thanks.
    Are you sure the brake is properly aligned with the rotor? Avid gives instructions on its site on how to do this.

    My front brake on my OCR-T was not working well when I got the bike - just like yours. I replaced the pads and aligned and adjusted the caliper. Now it works quite well. Don't forget to clean the rotor (alcohol or brake cleaner) when you replace the pads.
    I don't even use the offensive term "Fred." -- Sheldon "All Cyclists Are My Friends" Brown (1944-2008)

  3. #3
    Senior Member Ziemas's Avatar
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    Quote Originally Posted by Phantoj
    Are you sure the brake is properly aligned with the rotor? Avid gives instructions on its site on how to do this.

    My front brake on my OCR-T was not working well when I got the bike - just like yours. I replaced the pads and aligned and adjusted the caliper. Now it works quite well. Don't forget to clean the rotor (alcohol or brake cleaner) when you replace the pads.
    Yes, all is aligned and clean. It works beautifully when wet, terribly when dry.....

  4. #4
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    Is it a Road BB7 or MTB? Any funny sounds?

    Mine seems to work about the same wet or dry...
    I don't even use the offensive term "Fred." -- Sheldon "All Cyclists Are My Friends" Brown (1944-2008)

  5. #5
    Senior Member Ziemas's Avatar
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    MTB, no funny funny sounds.

  6. #6
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    My advice would be to go slow and avoid hills.
    I don't even use the offensive term "Fred." -- Sheldon "All Cyclists Are My Friends" Brown (1944-2008)

  7. #7
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    Or keep your water bottle handy to dash onto the rotor for a quick stop.
    I don't even use the offensive term "Fred." -- Sheldon "All Cyclists Are My Friends" Brown (1944-2008)

  8. #8
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    Seriously, if you've got it set up right, and new clean pads, what more is there?

    You could: take off the caliper and make sure it's operating smoothly.
    check the length of the cable and make sure there's no kinks or other bad stuff

    Sorry, I can't think of what the problem could be...
    I don't even use the offensive term "Fred." -- Sheldon "All Cyclists Are My Friends" Brown (1944-2008)

  9. #9
    Sir Fallalot wroomwroomoops's Avatar
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    How about this (if you have the time): clean both rotors first, wich alcohol. Then, swap the front and rear brake pads. If the calipers are really aligned properly, then the only thing could be some greasy substance in one (or both) front brakepads. Swapping front and rear pads, you could confirm this theory, because then the front would brake and the rear wourldn't. Perhaps even just a visual inspection of the brakepads could reveal something.

  10. #10
    Senior Member Ziemas's Avatar
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    Quote Originally Posted by wroomwroomoops
    How about this (if you have the time): clean both rotors first, wich alcohol. Then, swap the front and rear brake pads. If the calipers are really aligned properly, then the only thing could be some greasy substance in one (or both) front brakepads. Swapping front and rear pads, you could confirm this theory, because then the front would brake and the rear wourldn't. Perhaps even just a visual inspection of the brakepads could reveal something.
    Excellent idea! Thanks!

  11. #11
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    You could also swap rotors and (maybe ?) calipers, if needed...

    When you take out your pads, check them carefully to see if they're unevenly worn (bad alignment).

    And keep your water bottle full!
    I don't even use the offensive term "Fred." -- Sheldon "All Cyclists Are My Friends" Brown (1944-2008)

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