Advertise on Bikeforums.net



User Tag List

Results 1 to 10 of 10
  1. #1
    Junior Member
    Join Date
    Jul 2007
    Posts
    5
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Trek 7.3 FX Disc - Squeaky disc brakes

    Hi Everyone,

    Recently purchased a used Trek 7.3FX disc (2009 or 2010 model I believe). Before I bought it, I had a test run and the brakes were squeaking very hard as I applied the brake. The owner decided to knock off another $50 for me to take it for a tune-up. I took the risk and decided to purchase it anyways, seeing it was a fairly good deal (I believe) at $350 CAD including pump and lock.

    Question is, the squeaky noise, is that because the disc brakes need some oil (he hasn't ridden it in a couple years)? What should I apply to the disc brakes to fix the squeaking, or is it a bigger problem than that?

    Thanks,
    Matthew

  2. #2
    Senior Member
    Join Date
    Jul 2012
    Location
    Michigan
    My Bikes
    2013 Trek 7.2 FX, 2010 Trek 4300 Disc
    Posts
    218
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    No oil. Clean pads and disc gently but don't get finger oils on the pad surface. You might simply need new pads given the age. Doesn't sound like a big deal. Congrats on the bike.

  3. #3
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    39,842
    Mentioned
    25 Post(s)
    Tagged
    0 Thread(s)
    Take the disc pads out they may have a surface glazing to remove.

    My disc brake in front squeaks just when I'm going slowest and about to stop and it's raining.

    any oil as said is a contamination, then you must buy new pads.

  4. #4
    aka Phil Jungels Wanderer's Avatar
    Join Date
    Apr 2005
    Location
    North Aurora, IL
    My Bikes
    Road & Hybrid
    Posts
    5,467
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    Many times, you can cut thru the glaze, with fine sandpaper on a very flat surface....... Like glass, or a formica counter top.

    "Retirement is the best job I ever had!" Me, 2009


    Specialized Crosstrail Sport - '08
    Nishiki Sport - misappropriated from my youngest son (circa 1984)
    Marin Stinson - misappropriated by my youngest grandson - '01
    "The Beast" - 1990 Schwinn Airdyne (in the basement for winter torture)

  5. #5
    PatronSaintOfDiscBrakes dynaryder's Avatar
    Join Date
    Apr 2005
    Location
    dropped and lost in Washington DC
    Posts
    5,788
    Mentioned
    10 Post(s)
    Tagged
    0 Thread(s)
    First just clean the discs. Take some Windex or other cleaner and wipe off the rotors. It's common for discs to squeak when they get dirty;they usually quiet down on their own after a couple good stops.

    It's also possible that he put in different pads that are noisy,this happens sometimes with certain pad/rotor combinations. I swapped out the Hayes hydros on my Pt Reyes for Avid BB7's,but kept the original rotors. They squeal a little,but not enough for me to go to the effort of replacing the rotors or trying new pads.

    C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport/Qualifier,Brompton S6L,Dahon Speed Pro TT

  6. #6
    Senior Member xoxoxoxoLive's Avatar
    Join Date
    May 2010
    Location
    Jacksonville FL
    My Bikes
    2013 TREK 7.6 FX
    Posts
    2,275
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Wanderer View Post
    Many times, you can cut thru the glaze, with fine sandpaper on a very flat surface....... Like glass, or a formica counter top.
    And clean your rotors with rubbing alcohol.
    2013 TREK 7.6 FX

  7. #7
    Junior Member
    Join Date
    Jul 2007
    Posts
    5
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    great suggestions! I'll work on the bike this weekend and let you guys know how it works out.

    many thanks to all of you.

  8. #8
    aka Phil Jungels Wanderer's Avatar
    Join Date
    Apr 2005
    Location
    North Aurora, IL
    My Bikes
    Road & Hybrid
    Posts
    5,467
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    By all means, use the alcohol to clean the rotors. Windex, or similar cleaners contain surfactants and detergents that will contaminate the area you are trying to clean Alcohol will clean them the best..

    "Retirement is the best job I ever had!" Me, 2009


    Specialized Crosstrail Sport - '08
    Nishiki Sport - misappropriated from my youngest son (circa 1984)
    Marin Stinson - misappropriated by my youngest grandson - '01
    "The Beast" - 1990 Schwinn Airdyne (in the basement for winter torture)

  9. #9
    Junior Member
    Join Date
    Jul 2007
    Posts
    5
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Just a quick update, turns out the disc brakes were perfectly fine... I gave it another ride after I got home and the squealing was gone. Probably as most of you brought up, just a layer of glaze on the pads.

    To be safe, I took it back to the bike shop where the original owner purchased it and got a free tune-up (he bought the lifetime tune-up with the bike).

    Now off to enjoy the bike...if only it would stop raining here.

  10. #10
    Senior Member
    Join Date
    Jan 2006
    Location
    Seattle
    My Bikes
    Trek 7.2FX Disc
    Posts
    84
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by owoOWOowo View Post
    Just a quick update, turns out the disc brakes were perfectly fine... I gave it another ride after I got home and the squealing was gone. Probably as most of you brought up, just a layer of glaze on the pads.

    To be safe, I took it back to the bike shop where the original owner purchased it and got a free tune-up (he bought the lifetime tune-up with the bike).

    Now off to enjoy the bike...if only it would stop raining here.
    that's why you have discs... ride in the rain!
    2013 Trek 7.2FX

Posting Permissions

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