Advertise on Bikeforums.net



User Tag List

Results 1 to 6 of 6
  1. #1
    Senior Member AddictedToMusic's Avatar
    Join Date
    Mar 2011
    My Bikes
    Big Wheel
    Posts
    89
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Problems with rear brake

    I post this at the Mech section.. but got no responds, perhaps here would be better. Recently I replace the brake pads on Tektro R540 (dual-pivot sidepull brake caliper) for my road bike. I followed the instructions on Zinn's road bike maintenance book, but I have some problems with the rear brake tensions.

    First I tried adjusting the barrel adjuster (82), but since the new brake pads are thicker than the old used ones. I loosen the cable fixing bolt (70) to readjust the tension. After everything seems ok, I tighten the cable fixing bolt. But then once I hit the brake, the tension became loose again, and I can see the brake is almost rubbing the rim until I use my hand to open the brakes myself, (as if the spring doesn't work). I try this a couple times and still couldn't solve the problem.

    I bought this bike last year, and I think the spring should still be good. The front brake is still pretty good too. I checked the cable, doesn't seems to be damaged neither. I am not sure what else to check. Please let me know you know what the problem might be and how I could fix it. I would like to try to fix this myself before I go ask help at the LBS. Thanks in advanced.

    Last edited by AddictedToMusic; 04-29-12 at 07:30 AM.

  2. #2
    Member
    Join Date
    May 2011
    Posts
    26
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Without the cable attached, if you squeeze the calipers closed, do they return to a fully open position? If not I'd say you have an issue with the spring.

  3. #3
    Crispy Member ahsposo's Avatar
    Join Date
    Jan 2010
    Location
    Open the Bag and Eat Me.
    My Bikes
    A Home Built All Rounder, Bianchi 928, Specialized Langster, Dahon Folder
    Posts
    6,975
    Mentioned
    12 Post(s)
    Tagged
    1 Thread(s)
    It could be crud in the cable housing.

    I've had sweat evaporates accumulate in the cable housing but they tend to render the brake totally inoperative.

    Or you could have a burr on the cable housing at the entrance or the exit that's restricting the free movement of your cable.

    If you were to remove the wheel and the cable from the brake, when you squeeze the calipers together are they "pushing" back against you and snapping back into position?

    Did you lube the pivots well with Tri-Flo or a silicon lube?
    Quote Originally Posted by toddles View Post
    If I gotta look up words, it's not worth my time.

  4. #4
    Century bound Phil85207's Avatar
    Join Date
    Jan 2010
    Location
    Mesa Arizona
    My Bikes
    Felt AR4 and Cannondale hybrid
    Posts
    2,249
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Well???
    Chief Executive In Charge Of Diddly Squat.

    Taking on a long hill is like fighting a Gorilla. You don't stop when you are tired, You stop when the Gorilla is tired.

    Now ridding a
    Felt AR4 with Mavic Super light Premium wheels
    Cannonade Hybrid

    If you lack the courage to start, you have already finished.

    In God we trust

  5. #5
    Senior Member AddictedToMusic's Avatar
    Join Date
    Mar 2011
    My Bikes
    Big Wheel
    Posts
    89
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    ok, I just tested it. without the cable, the brake opened just a little (not fully) after I pushed them against the wheel. Let me take the rear brake out to see if I can find the pivot point the clean/lube it.

  6. #6
    Senior Member AddictedToMusic's Avatar
    Join Date
    Mar 2011
    My Bikes
    Big Wheel
    Posts
    89
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    and it improve slightly.. but not completely, i will bring the bike in to the bike shop and check.. otherwise.. i guess i will replace the Tektro R540 with the 105 brake set... but sigh. that is costly. for that i just got the SwissStop green pad.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •