Overflowing master cylinder

Discussion in 'General (Main)' started by duggoey, Jul 3, 2013.

  1. duggoey Husqvarna
    AA Class

    Location:
    NSW, Australia
    Husqvarna Motorcycle:
    2010 TE 310
    Other Motorcycles:
    KTM 690 Enduro, Yamaha WR200
    What would cause the master cylinder reservoir to overflow and weep on the brembo version on my Ktm 690? The pads are not dragging on the disk and the fluid isn't boiling or even getting warm. Have emptied out a few mls of fluid a few times but last 2 rides I have had the lever play reduced to nil and fluid start to weep.
  2. Caiman Senior Vice Procrastinator

    Location:
    Sydney, Australia
    Husqvarna Motorcycle:
    SMR 511, Nuda 900R
    Damaged bladder under the lid?
  3. duggoey Husqvarna
    AA Class

    Location:
    NSW, Australia
    Husqvarna Motorcycle:
    2010 TE 310
    Other Motorcycles:
    KTM 690 Enduro, Yamaha WR200
    Possibly, but the reservoir is definitely "producing" fluid. I.e. I empty a bit out and after the next ride it is full again. One other symotom is the lever action becomes engaged with the smallest pull of the lever.
  4. rancher1 Husqvarna
    AA Class

    Location:
    WA
    Have you installed new pads recently ? They could be thicker than the previous ones causing this condition.
  5. joedirt Husqvarna
    AA Class

    Location:
    PA
    Husqvarna Motorcycle:
    wr250
    Its not possible for the reservoir to "produce" fluid.
  6. Sceep Husqvarna
    A Class

    Location:
    'Burque
    Husqvarna Motorcycle:
    '09 te310
    Other Motorcycles:
    '94 st1100
    bent rotor forcing pads open and backflowing fluid?

    x2 no "production" happening
  7. duggoey Husqvarna
    AA Class

    Location:
    NSW, Australia
    Husqvarna Motorcycle:
    2010 TE 310
    Other Motorcycles:
    KTM 690 Enduro, Yamaha WR200
    Thanks for that, I'm glad you think it is strange also. It defies logic.
  8. duggoey Husqvarna
    AA Class

    Location:
    NSW, Australia
    Husqvarna Motorcycle:
    2010 TE 310
    Other Motorcycles:
    KTM 690 Enduro, Yamaha WR200
    No new pads. They are originals, about 70% spent. Also the rotor is true and balanced. That's why I'm stumped.
  9. Xcuvator Husqvarna
    Pro Class

    Location:
    Scholls Oregon
    Husqvarna Motorcycle:
    TE450,610 WB165,WR250 6spd & XC430
    Other Motorcycles:
    yes
    Does your lever feel solid and not spongy? Air in the system will expand more than fluid when things warm up from use. Does the brake completely release when warmed up?
    Just a thought.
  10. duggoey Husqvarna
    AA Class

    Location:
    NSW, Australia
    Husqvarna Motorcycle:
    2010 TE 310
    Other Motorcycles:
    KTM 690 Enduro, Yamaha WR200
    Not spongy at all, nice and firm, good feel and stopping power.
  11. Xcuvator Husqvarna
    Pro Class

    Location:
    Scholls Oregon
    Husqvarna Motorcycle:
    TE450,610 WB165,WR250 6spd & XC430
    Other Motorcycles:
    yes
    Weird,
    I'm grasping at straws here but, the wheel bearings aren't loose are they?
  12. duggoey Husqvarna
    AA Class

    Location:
    NSW, Australia
    Husqvarna Motorcycle:
    2010 TE 310
    Other Motorcycles:
    KTM 690 Enduro, Yamaha WR200
    Na, they are in excellent condition. I removed fluid down to the min level and went for a long ride today with a plus 1 on the back and didn't see any escape. I'll see how it goes. Maybe I can start selling the excess.
  13. ghte Husqvarna
    Pro Class

    Location:
    Sydney Australia
    Husqvarna Motorcycle:
    2 x 310's
    Other Motorcycles:
    2012 MultistradaS, 73Ossa, 850 Griso
    Just bleed off a tad more. Common error is to over fill the cylinder