Ktm 450 - rear brake overheating

Discussion in 'Thumpers' started by alexisan, Apr 28, 2013.

  1. alexisan

    alexisan Been here awhile

    Joined:
    Nov 25, 2010
    Oddometer:
    190
    Was riding yesterday and ever so often I lost the rear brake. It came back after cooling down the rear master.
    The piston seems to be moving freely but the pads are sticking to the disc...what can one do?
    #1
  2. Jacl-Kampuchea

    Jacl-Kampuchea Booze Merchant

    Joined:
    Sep 27, 2010
    Oddometer:
    880
    Location:
    I see Drunk People.
    If you were riding in mud it could be causing friction.

    Or you may simply be leaving your foot slightly on the brake pedal - try lowering it a cm or two.
    #2
  3. fastdadio

    fastdadio Still gettin faster

    Joined:
    Sep 18, 2009
    Oddometer:
    3,121
    Location:
    Pinckney Mi.
    Other possible causes are; Brake fluid reservoir over full. Fluid return port in reservoir plugged. In either of these two cases, as the fluid heats and expands, it has nowhere to go and begins to put pressure on the piston. A quick way to pinpoint this problem is to open the bleed port on the caliper when its hot and dragging. If fluid squirts out and it also relieves the dragging brake you then know the expanding fluid is under slight pressure. If that is indeed the case, rebuild the master cyclinder and pay close attention to the return port.
    #3
  4. Possu

    Possu de-nOObed!

    Joined:
    Jan 9, 2004
    Oddometer:
    5,230
    Location:
    Oxford, UK
    Also check that the two halves of the sliding caliper set-up are moving freely.
    #4
  5. alexisan

    alexisan Been here awhile

    Joined:
    Nov 25, 2010
    Oddometer:
    190
    Will Check that all out. Thanks so far
    #5