Advertise on Bikeforums.net



User Tag List

Page 1 of 3 123 LastLast
Results 1 to 25 of 64
  1. #1
    Member
    Join Date
    Jun 2012
    Posts
    30
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Trek 8.4 DS - anyone else have noisy back brake?

    I've been struggling with this back brake since I got the bike. It was noisy from the beginning, but I thought it would go away. Instead it got worse, and developed into a super-loud harmonic honk each time I hit the back brake. The Trek 8.4 DS comes with Hayes Dyno brakes so I contacted Hayes. Their support has been very responsive. Following their suggestion, I removed the glaze from the pads and tried to bed them in again. Last night I rode around the parking lot making hard stops and thought I was making progress. But, the harmonic vibration started showing up again. This morning, with cold brakes, the sound is coming back strong. I'm getting discouraged. A certain amount of noise is expected, but when people turn their heads to see what the problem is, it's too much.

    Has anyone else experienced this? The Hayes tech indicated that a noisy back brake is a known issue, specifically with the 8.4 DS. I would love to find a solution to this problem that doesn't involve buying new brakes.

  2. #2
    Ha ha ha ha ha giantcfr1's Avatar
    Join Date
    May 2005
    Location
    Kyoto;JAPAN
    My Bikes
    2004 ORBEA Mitis2 Plus Carbon, 2007 Cannondale Bad Boy Si Disc, 2012 Trek Gary Fisher Collection Marlin WSD 29er
    Posts
    4,276
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by rustybyker View Post
    .... A certain amount of noise is expected...

    Has anyone else experienced this? The Hayes tech indicated that a noisy back brake is a known issue, specifically with the 8.4 DS. ....
    I don't think that a "certain amount of noise should be expected" as I have cheap tektro calipers and pads on avid discs and have absolutely no sound coming from them. Ever!

    I have experienced the problem though with avid pads in avid calipers on avid discs but the noise went when I changed the pads to BBB.

    I find it almost amusing that the Hayes Tech tries to indicate that the problem is specifically with the 8.4 DS.

    I'd simply try to swap out the pads with a cheaper set, and see how you go.

    EDIT...sorry obvious question...Have you taken the bike back to the bike shop where you purchased it so the mechanic there can have a go? That way it should be fixed up under warranty.
    Last edited by giantcfr1; 06-28-12 at 07:30 AM.

  3. #3
    Ha ha ha ha ha giantcfr1's Avatar
    Join Date
    May 2005
    Location
    Kyoto;JAPAN
    My Bikes
    2004 ORBEA Mitis2 Plus Carbon, 2007 Cannondale Bad Boy Si Disc, 2012 Trek Gary Fisher Collection Marlin WSD 29er
    Posts
    4,276
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I see there is already a discussion going on about the same issue. Some fellow TREK riders... http://www.bikeforums.net/showthread...rek-8-3-Owners

    (they're on 8.3's not 8.4's but I'm sure 0.1 wouldn't make much difference. )

  4. #4
    Senior Member choclabman's Avatar
    Join Date
    Aug 2011
    Location
    Central Florida
    My Bikes
    2011 Trek 8.4 DS
    Posts
    126
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I've got an 8.4 but haven't had any problems with noisy brakes. Zerogravity also has one so maybe he has experienced this or knows someone who has. Sorry I couldn't be of any help.

  5. #5
    Senior Member
    Join Date
    Nov 2011
    Location
    Owings Mills, Maryland
    My Bikes
    2011 Trek 8.4 DS hybrid; 2012 Felt F-75 road bike; 1990 Specialized Stumpjumper MTB; 1992 Guerciotti road bike (inactive)
    Posts
    494
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    On my 8.4, I only had the hydraulic DBs on the bike for 2 weeks before I happily changed them out for mechanical DBs. Anyway, I had no noise problems in that 2 wks. Sorry.
    I do know how you feel, though. I get major squeels from my rim brakes on my MTB sometimes It's very annoying!

  6. #6
    Junior Member
    Join Date
    Jun 2012
    Location
    Haymarket, VA
    My Bikes
    Madone 2.1
    Posts
    8
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I have had my 8.4 for about 3 weeks and brought the bike back to the shop after a week and they adjusted the wheel and rotor and so far I have not had any noise since.

  7. #7
    Trek DS 8.4 Rider! zerogravity's Avatar
    Join Date
    Oct 2011
    Location
    Anaheim, CA
    My Bikes
    1991 Gt Avalanche, 2012 DS 8.4
    Posts
    478
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I have that issue. I sanded the rotors and the brake pads and it is still there. I even upgraded the brakes from Hayes to Shimano Deores(Not rotors) and still have the hum. I have concluded that they are the Hayes Rotors. I can live with the hum, but when it is time to replace them, i will be getting some Shimano rotors..more than likely the ICETECH rotors.
    ''Many of life's failures are people who did not realize how close they were to success when they gave up.''-- Thomas Alva Edison

  8. #8
    Member
    Join Date
    Jun 2012
    Posts
    30
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I took the bike to the LBS and the tech worked on the back brake while I watched. He sanded the pads, scuffed the rotor and made some other adjustments. He also cleaned everything with a special degreaser that doesn't leave a residue. He took it out to the parking lot and didn't hear the noise, as I suspected he wouldn't. The noise doesn't show up until the friction starts to increase in the brakes. I took it for a longer test ride (maybe 5 minutes) and as the brakes started to grab more, the sound came back. This is not a high-pitched squeal. It's a loud vibration that you can feel through the bike. When I got back, the tech heard the noise and said he would talk to Trek about warranty service. I left the bike there a few days ago. I'll call the LBS today to see what the plan is.

  9. #9
    Senior Member
    Join Date
    Apr 2011
    Posts
    1,120
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by zerogravity View Post
    I have that issue. I sanded the rotors and the brake pads and it is still there. I even upgraded the brakes from Hayes to Shimano Deores(Not rotors) and still have the hum. I have concluded that they are the Hayes Rotors. I can live with the hum, but when it is time to replace them, i will be getting some Shimano rotors..more than likely the ICETECH rotors.
    It may be more the model of the rotor. I have a Shimano M596 brake on the front and Hayes rotor that do not squeal, but I may have a different rotor design. The original brake was a mechanical Hayes MX4.

  10. #10
    Junior Member
    Join Date
    Dec 2011
    Location
    SF Bay Area, Ca
    My Bikes
    Waiting to pick up my Trek 8.3 DS - its paid for
    Posts
    22
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Let me know what they say at the lbs! I have had my bike (trek 8.3) since Christmas and since day one the brakes have squealed. Just been a lazy a^* and haven't gone. Maybe this week I'll take it in.

  11. #11
    Member
    Join Date
    Jun 2012
    Posts
    30
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I called the LBS on the weekend and the tech said he hoped it wouldn't take more than a week to fix it. But, I'm not really sure what Trek is planning to do. I really hate not being able to ride the bike.

  12. #12
    Ha ha ha ha ha giantcfr1's Avatar
    Join Date
    May 2005
    Location
    Kyoto;JAPAN
    My Bikes
    2004 ORBEA Mitis2 Plus Carbon, 2007 Cannondale Bad Boy Si Disc, 2012 Trek Gary Fisher Collection Marlin WSD 29er
    Posts
    4,276
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by rustybyker View Post
    .... When I got back, the tech heard the noise and said he would talk to Trek about warranty service. I left the bike there a few days ago. I'll call the LBS today to see what the plan is.
    This is freekin' pathetic that the "tech" at your shop can't give you a definite answer to what specifically is the problem. Talk to Trek about warranty service??? What does that mean? If you are not at fault with damaging it, your "tech" should be fixing it straight up. Once your problem is fixed, move to a different Trek Dealer. Your LBS "tech" is more suited to Wallyworld Bike tech work. BTW, since when did a bike mechanic become a "tech"?

  13. #13
    Member
    Join Date
    Jun 2012
    Posts
    30
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The bike mechanic did try to fix it. I watched him go through the whole process. It didn't work. He said he would contact Trek about getting it fixed under warranty. From my understanding, it means Trek will send parts and the LBS guy will replace stuff until the bike starts working as designed. I don't know what parts they will try. This seems to be my only option at this point if I expect to get things done under warranty. It's stressful knowing I paid a bunch of money for something that's already in the shop. If they don't end up giving me a bike that works, I will certainly make my complaints known to them and to every friend and acquaintance who will listen, including blogs, Facebook, and anyplace else I can think of. But, until then, I will work with their process and keep my cool.

  14. #14
    Ha ha ha ha ha giantcfr1's Avatar
    Join Date
    May 2005
    Location
    Kyoto;JAPAN
    My Bikes
    2004 ORBEA Mitis2 Plus Carbon, 2007 Cannondale Bad Boy Si Disc, 2012 Trek Gary Fisher Collection Marlin WSD 29er
    Posts
    4,276
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by rustybyker View Post
    The bike mechanic did try to fix it. I watched him go through the whole process. It didn't work. He said he would contact Trek about getting it fixed under warranty. From my understanding, it means Trek will send parts and the LBS guy will replace stuff until the bike starts working as designed. I don't know what parts they will try. This seems to be my only option at this point if I expect to get things done under warranty. It's stressful knowing I paid a bunch of money for something that's already in the shop. If they don't end up giving me a bike that works, I will certainly make my complaints known to them and to every friend and acquaintance who will listen, including blogs, Facebook, and anyplace else I can think of. But, until then, I will work with their process and keep my cool.
    You are being very patient and I wish you luck. There is nothing worse than making a purchase (expensive purchase in this case) and not having 100% satisfaction.

  15. #15
    Member
    Join Date
    Jun 2012
    Posts
    30
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I have some good news to report. No more noisy back brake!!! The LBS worked on the pads and the rotor 4 or 5 times, and the noise still kept coming back as strong as ever. Trek ended up replacing the frame and it's all good now. I'm very happy with the bike, happy with Trek, and especially happy with the LBS for making sure I got a bike that worked.

  16. #16
    MUP World Champ adamhenry's Avatar
    Join Date
    Jun 2012
    Location
    Oceanside, CA
    Posts
    221
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The frame was replaced to quiet the brakes? I wonder what the issue was with the frame?

  17. #17
    Senior Member
    Join Date
    Apr 2011
    Posts
    1,120
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I wonder if something just needed to be greased. I did not think of this before but in automotive disc brakes, some grease is typically applied to the back of the brake pad to prevent squealing. I wonder if it was something like that.

  18. #18
    Junior Member
    Join Date
    Jul 2012
    Location
    Bay Area, CA
    Posts
    14
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    My 8.4 is new and so far the rear brake is quiet. I can tell you that I had a Raleigh Talus 5.0 that had horribly noisy rear mechanical disc brakes that were replaced and still were awful, so bad that the shop took the bike back. I also had a Cannnondale with hydraulic disc brakes where the front brake was noisy, but not as bad as the Raleigh. I learned to live with it. Both sounded like the brake was under water and was scraping on the openings in the disc. So far this has not happened on my 8.4 DS, but it only has something like 100 miles on it so far.

  19. #19
    Member
    Join Date
    Jun 2012
    Posts
    30
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    This is not a normal squeal of brake pads. It is a very loud buzzing honk that vibrates through the entire bike. Over the course of their troubleshooting the LBS de-glazed the pads and scuffed the rotor about 5 times. They also tried new brake pads. None of this helped. As the pads would start to gain friction in the bed-in process, I would begin to hear an audible tone. As the process went on, the tone would eventually build into an extremely loud vibration that made the back brake essentially useless for anything other than waking the dead.

    I talked with a guy from Hayes, the brake manufacturer, and he said he has seen this problem before and they have been studying it. They have many thousands of these brakes (Hayes Dyno) in production, and this problem has been only been reported in a few models of bikes, the Trek 8.4 DS being one of them.

    If you look at the difference between the 8.4 DS from 2012 and 2013, the back brake is bolted on in a completely different place. This leads me to believe there have been problems in at least some of the 8.4 DS frames. Otherwise, why move it? My theory is, the brake somehow vibrates at a certain frequency when the pads contact the rotor, and my 8.4 DS frame vibrated at a similar frequency, which caused the vibration to amplify. I do know that sometimes if I reached back during braking, and grabbed the small frame tube attached to the brake (being careful not to kill myself in the process), the vibration would go away, and the brake would act and sound perfectly normal. So, it wasn't a problem with glazed pads screeching on the rotor.

    In summary, I'm not saying everyone who owns a Trek 8.4 DS from 2012 is going to have this issue. But I did. I'm very glad the problem is solved. I went on two 10-miles rides and loved every minute. I highly recommend this bike to anyone who is thinking of getting one.

  20. #20
    Senior Member
    Join Date
    Apr 2011
    Posts
    1,120
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by rustybyker View Post

    If you look at the difference between the 8.4 DS from 2012 and 2013, the back brake is bolted on in a completely different place. This leads me to believe there have been problems in at least some of the 8.4 DS frames. Otherwise, why move it? My theory is, the brake somehow vibrates at a certain frequency when the pads contact the rotor, and my 8.4 DS frame vibrated at a similar frequency, which caused the vibration to amplify. I do know that sometimes if I reached back during braking, and grabbed the small frame tube attached to the brake (being careful not to kill myself in the process), the vibration would go away, and the brake would act and sound perfectly normal. So, it wasn't a problem with glazed pads screeching on the rotor.
    The 2012 and 2013 DS line are completely different. The reason to move the brake location is to better accommodate racks and fenders. The 2013 has been changed to be more oriented towards road riding. By tucking the brake into teh triangle, it's possible to use just about any rack rather than disc-specific racks.

  21. #21
    Junior Member
    Join Date
    Jul 2012
    Location
    Missouri
    My Bikes
    Trek 8.4 DS
    Posts
    8
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by giantcfr1 View Post
    I don't think that a "certain amount of noise should be expected" as I have cheap tektro calipers and pads on avid discs and have absolutely no sound coming from them. Ever!

    I have experienced the problem though with avid pads in avid calipers on avid discs but the noise went when I changed the pads to BBB.

    I find it almost amusing that the Hayes Tech tries to indicate that the problem is specifically with the 8.4 DS.

    I'd simply try to swap out the pads with a cheaper set, and see how you go.

    EDIT...sorry obvious question...Have you taken the bike back to the bike shop where you purchased it so the mechanic there can have a go? That way it should be fixed up under warranty.

    Hi. I have an 8.4 DS that I purchased within the last 2 months and have the exact same issue. I thought after I had a few more miles on it and took it in for the initial service that I would mention it. I hope this isn't an ongoing issue. It is not only annoying (the sound) but has me not feeling overly confident about the stopping power if I get in a bad situation.

  22. #22
    Junior Member
    Join Date
    Jul 2012
    Location
    Missouri
    My Bikes
    Trek 8.4 DS
    Posts
    8
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by rustybyker View Post
    I took the bike to the LBS and the tech worked on the back brake while I watched. He sanded the pads, scuffed the rotor and made some other adjustments. He also cleaned everything with a special degreaser that doesn't leave a residue. He took it out to the parking lot and didn't hear the noise, as I suspected he wouldn't. The noise doesn't show up until the friction starts to increase in the brakes. I took it for a longer test ride (maybe 5 minutes) and as the brakes started to grab more, the sound came back. This is not a high-pitched squeal. It's a loud vibration that you can feel through the bike. When I got back, the tech heard the noise and said he would talk to Trek about warranty service. I left the bike there a few days ago. I'll call the LBS today to see what the plan is.

    This is exactly the same issue I'm having as well..................please let us know what they tell you. Thanks.

  23. #23
    MUP World Champ adamhenry's Avatar
    Join Date
    Jun 2012
    Location
    Oceanside, CA
    Posts
    221
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Davidus1 View Post
    This is exactly the same issue I'm having as well..................please let us know what they tell you. Thanks.
    He already did. Trek replaced the frame.

  24. #24
    Member
    Join Date
    Jun 2012
    Posts
    30
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The mechanic at the LBS had to do quite a bit of testing so they could be sure it wasn't a problem with the brakes themselves. After all was said and done, Trek replaced the frame. My brakes work great. No noise. What a beautiful sound.

  25. #25
    Senior Member
    Join Date
    Aug 2010
    Posts
    86
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I have a 2012 8.5 that I bought late last summer. I have about 2k km on it now and the shimano hydraulic brakes are perfectly silent.

    Im glad it all worked out for you.

Page 1 of 3 123 LastLast

Posting Permissions

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