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  1. #1
    Senior Member rekon's Avatar
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    Disc Brakes Not Gripping

    My front brakes were working fine earlier... However, I was messing the brakes to get rid of a noise from my wheel.

    I did the following:

    • I loosened my caliper and tightened it while holding the front brake lever.
    • I loosened the anchor and pulled the cable.


    Now my front brakes are not gripping at all. Excuse my noobness i'm pretty new at this. Please help.

    WP_20140416_004.jpgWP_20140416_005.jpg

  2. #2
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    If that really is all you did....
    What happens when you squeeze the lever, does it go all the way into the bar w/o the brake biting?
    In that case, you have too much slack in the system. You need to undo the cable clamp, pull the cable tighter, (= pull the end away from the clamp, downwards) then tighten the clamp again.

  3. #3
    Senior Member clydeosaur's Avatar
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    As stated, you might have too much slack in your cable. Readjust (you have a tension adjust where the cable housing enters the caliper). As well, you have pad adjustment. See the red thumb dial ? That will adjust your inboard pad. I can't see, but you might also have an outboard pad adjustment for fine tuning. You can watch the pads / rotor gap as you adjust. Keep in mind, you want to make sure your caliper is centered/aligned properly before doing all this. The other thing you will want to do is clean your rotors / pad surfaces as well to avoid noise.
    Last edited by clydeosaur; 04-17-14 at 05:12 AM.

  4. #4
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    Avid BB5 / BB7 Setup & Installation: http://cdn.sram.com/sites/default/fi...d7_English.pdf

  5. #5
    bike whisperer Kimmo's Avatar
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    Quote Originally Posted by dabac View Post
    In that case, you have too much slack in the system. You need to undo the cable clamp, pull the cable tighter, (= pull the end away from the clamp, downwards) then tighten the clamp again.
    Because of all the mechanical advantage of disc calipers, you can't treat them like rim brakes like that. As the pads wear a little bit, it takes a lot more cable pull to make up the distance.

    So barrel adjusters on disc brake cables are only for fine adjustment, and you don't want to be adjusting it with the pinch bolt so much either.

    Which is why they have pad adjusters on one or hopefully both sides, and that's where you start when you run out of barrel adjuster.

    When there's two adjusters, with the cable disconnected I tighten them up until they're both against the rotor, holding it centrally in the caliper's slot. Then I'll loosen and re-tighten the caliper mounting bolts to ensure it's properly aligned.

    Then, feeling the amount of cable pull by working the arm, I loosen the adjusters on each side until there's enough gap for a rotor in half-decent shape not to rub; if the rotor's not in decent shape I tweak it with an adjustable wrench.

    Attach cable with all barrel adjusters screwed home, slight adjustment, done.

    IMO the pad gap should be enough so that the lever's roughly parallel with the grip when the pads contact.

  6. #6
    Senior Member rekon's Avatar
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    Thanks. So, I loosened the cable clamps, pulled it and clamped it back down. I now have tension in the lever but the brakes are not gripping.

  7. #7
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    I would just slap them while screaming, "Get a grip!"

    Just funnin' ya.
    Robert

    My hero: "Tar-Baby ain't sayin' nuthin'..." (Joel Chandler Harris, Uncle Remus")

  8. #8
    coprolite fietsbob's Avatar
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    You have to look at the gap between the pad and the disc , not what it looks like, standing back .

    BB5 fixed pad adjustment, is the knob/Torx on the inside , moving pad the adjustment is the barrel adjuster ..

    Or just pulling the cable thru the clamp in the arm further and tightening it there ..


    try this: back out the barrel adjuster

    pull the cable thru the arm till the pad is against the disc, so wheel wont turn , then tighten it there .

    and turn back the barrel adjuster till the wheel moves again..
    Last edited by fietsbob; 04-17-14 at 11:10 AM.

  9. #9
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    Quote Originally Posted by rekon View Post
    Thanks. So, I loosened the cable clamps, pulled it and clamped it back down. I now have tension in the lever but the brakes are not gripping.
    At this point a trip to the LBS seems like a good idea.

  10. #10
    Senior Member rekon's Avatar
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    Quote Originally Posted by fietsbob View Post
    You have to look at the gap between the pad and the disc , not what it looks like, standing back .

    BB5 fixed pad adjustment, is the knob/Torx on the inside , moving pad the adjustment is the barrel adjuster ..

    Or just pulling the cable thru the clamp in the arm further and tightening it there ..


    try this: back out the barrel adjuster

    pull the cable thru the arm till the pad is against the disc, so wheel wont turn , then tighten it there .

    and turn back the barrel adjuster till the wheel moves again..
    This worked! Thank you!

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