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  1. #1
    Junior Member
    Join Date
    May 2010
    Bloomington Indiana, USA
    0 Post(s)
    0 Thread(s)

    Disc break periodic gripping

    I've got a little problem with my disc brakes. Bought a Giant Seek 2 recently with disc brakes, and both the front and back brakes have a periodic sticking. Once per revolution they grip more than they do otherwise. Needless to say, this makes braking inconsistent and annoying. Any idea what the problem is? I brought it in, and the guy who took a look at it said he didn't know how to fix it, but it sounds like a totally fixable problem.

    Edit: Brake...not break...whoops.
    Last edited by Wagh; 07-11-10 at 02:30 PM. Reason: Spelling

  2. #2
    Senior Member
    Join Date
    Apr 2009
    New Rochelle, NY
    My Bikes
    too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
    188 Post(s)
    1 Thread(s)
    If they're pulsing under when applied it's related to the rotor (disc) which might be warped, have a ding, or have some surface contamination which causes the friction to differ in various areas. Check the rotor, and clean, straighten or replace it as necessary. (search clean disc brake rotors for cleaning tips)

    If the brake is occasionally sticking or rubbing when not applied, it's either a bent rotor, or the caliper itself isn't releasing completely, and the possible causes differ depending on whether they're hydraulic, or cable activated brakes.

    My best quick guess is a dirty rotor, BTW- any decent mechanic with the bike in his hands should be able to diagnose the problem and suggest the fix. I'd consider finding a new mechanic along with working on the brake problem.
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