Advertise on Bikeforums.net



User Tag List

Results 1 to 8 of 8
  1. #1
    dazed and confused newkie's Avatar
    Join Date
    Dec 2010
    Location
    Ireland
    My Bikes
    2011 Cube Hyde Team Alfine 8 IGH, 2007 Giant Rock hardtail mtb
    Posts
    246
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Hydraulic brakes going soft

    After a getting a flat on Tues I finally retired my old tires and threw on a pair of Schwalbe Marathon Supremes. Had my bike upside down for the process. When I finished, I noticed the rear wheel brake noticely had more give than before. I have the squeeze the lever all the way to brake now.

    I can't figure out why how this could be. I've never had to do anything with my brakes since buying the bike nearly 2 years ago. Any ideas?

  2. #2
    http://www.538.nl acidfast7's Avatar
    Join Date
    Jul 2010
    Location
    England / CPH
    My Bikes
    2010 Cube Acid
    Posts
    4,937
    Mentioned
    10 Post(s)
    Tagged
    0 Thread(s)
    I've heard that certain brands of MTB hydraulic brakes MAY leak if stored upside down. I don't remember which brand but I think you need a flush/refill kit. I haven't done this personally yet, and I'm wondering how long I can ride until I have to.
    Movimento 5 Stelle (M5S)
    Rohloffs seen on the commute: 3

  3. #3
    Banned.
    Join Date
    Jun 2007
    Posts
    5,098
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)
    2 years w/o service? About time to have both brakes bled. You can buy a kit to DIY, or take it to a local shop to have it done.

  4. #4
    Senior Member
    Join Date
    Jul 2012
    Location
    ENID, OK
    Posts
    171
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You may have gotten air in your line while it was upside down.
    A good bleeding is in order.
    KHS Flite 500. Redline Metro Sport. 90s Schwinn Sidewinder SS.

  5. #5
    dazed and confused newkie's Avatar
    Join Date
    Dec 2010
    Location
    Ireland
    My Bikes
    2011 Cube Hyde Team Alfine 8 IGH, 2007 Giant Rock hardtail mtb
    Posts
    246
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks for the replies. You're probably right, I'm due a service anyway and the front pads came from the mfg contaminated so they're noisey.

    But interestingly, after standing upright all day at work it was back to normal for the commute home. Maybe there must be some air in the reservoir which made it's way in to the lines while upside down in the cold. I did squeeze the brakes to ensure the calipers were aligned when I put the wheels back on (still upside down).

    At least now I have the option to procrastinate although I take your point I'm probably due a service.

  6. #6
    Senior Member
    Join Date
    Feb 2012
    Location
    You have really nice furniture
    Posts
    821
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Certainly had to be air from the reservoir and when you flipped it and pulled the handle you pushed the air into the lines. Standing upright at work allowed the air to return to its highest point.
    Tailwinds make me feel like Superman and headwinds make me feel like Lois Lane.

  7. #7
    Senior Member
    Join Date
    Jul 2011
    Posts
    156
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Being upside down can temporarily do that to hydro brakes. It's happened a number of times with my Avid Elixirs. They go back to normal. That said, after two years, a good bleed is probably still in order.

  8. #8
    Senior Member Editz's Avatar
    Join Date
    Jul 2008
    Location
    Eugene, Oregon
    My Bikes
    Breezer Finesse
    Posts
    187
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    DIY bleed is pretty simple (for my Shimano anyway) and the local shops charge a lot. Same money would buy you enough fluid to last for years.

Posting Permissions

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