Advertise on Bikeforums.net



User Tag List

Results 1 to 5 of 5

Thread: Locked Brakes

  1. #1
    Newbie
    Join Date
    May 2008
    Posts
    2
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Locked Brakes

    Hi there,

    I was wondering if someone could help with a problem I am having with my mountain bike. I purchased it about 5 months ago, but haven't been able to ride it for the last 3 months due to an injury. In this time the bike has been in the shed and hasn't moved.

    I tried to get the bike out today but have found that the front and rear wheels are both locked as if the brakes are on full.

    The bike has hydraulic disk brakes and i've not had these on a bike before so am not very experienced wit them.

    Does anyone know if this is a common problem with these types of brakes? Any sugestions as to how I can get the wheels moving again?

    Thanks.

  2. #2
    Senior Member Retro Grouch's Avatar
    Join Date
    Feb 2004
    Location
    St Peters, Missouri
    My Bikes
    Rans Enduro Sport, Hase Kettweisel Tandem, Merin Bear Valley beater bike
    Posts
    23,765
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I don't know where you live but 5 months ago it was winter and cold out. I suspect that the warming weather has expanded your brake fluid and hydro-locked your brakes. If that's the case, bleeding the brakes will fix it.

  3. #3
    Newbie
    Join Date
    May 2008
    Posts
    2
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    That sounds plausable. Thanks, i'll give it a go.

  4. #4
    Senior Member Joshua A.C. New's Avatar
    Join Date
    Aug 2007
    Location
    Northampton, MA
    My Bikes
    Iron Monkey: a junkyard steel 26" slick-tired city bike. Grey Fox: A Trek 7x00 frame, painted, with everything built, from spokes up. Jet Jaguar: A 92 Cannondale R900 frame, powder coated matte black with red and aluminum highlights.
    Posts
    957
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    That doesn't happen. Hydraulic fluid is chosen because it doesn't change density the way, say, air does in a pneumatic system.

    There's a chapter in here about adjusting and repairing hydraulic brakes. I suggest reading up first, or taking it to your LBS.
    Joshua A.C. Newman,
    Passionate lover of construction

  5. #5
    Senior Member
    Join Date
    Mar 2008
    Posts
    4,188
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Niceaction View Post
    ..t haven't been able to ride it for the last 3 months ..have found that the front and rear wheels are both locked as if the brakes are on full...The bike has hydraulic disk brakes
    I don't know if bike brake rotors are always stainless or not. If they aren't there's a possibility that rust between rotor and pads are keeping the wheels immovable. Fairly common thing over here for vehicles that only gets used seasonally. Best option in that case would be to pull the pads, clean the rotor, install new pads, hope for not significantly scored rotor and get back to riding. Crude option is to force the wheels to move and hope that normal wear will clean things up. Put bike upside down and start pulling/yanking/wiggling wheels back & forth. Brakes would be very grabby during braking initially after having broken free.

Posting Permissions

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