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Clutch master cylinder bleed

LT132 Apr 16, 2018

  1. LT132

    LT132 New Member

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    We have rebuilt the clutch master cylinder ,flushed all the lines,disassembled cleaned and reassembled the slave cylinder which was in good shape. At this point we are on able to bleed the clutch system.Help!!
     
  2. Breeze

    Breeze Active Member

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    Can you provide a little more info as to what the problem you are seeing is?
     
  3. R. J.

    R. J. Senior Member

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    :hello: When pumping by hand using the clutch lever it can take up to 6 hours. Are you going from the top down with the fluid. Things will go faster if you pump up from the bottom.
     
  4. LT132

    LT132 New Member

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    We are unable to get fluid to bleed from the clutch reservoir to the slave cylinder. I know it takes time but we should be seeing some progress. We have tried using a syringe on the bleeder valve to draw fluid down - no luck. We have tried to back bleed- no luck all With the clutch handle squeezed
     
  5. VmaxRider

    VmaxRider Active Member

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    Bleed it at the banjo fitting first and work your way down to the slave.
     
    R. J. likes this.
  6. Breeze

    Breeze Active Member

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    I always find it helpful to put some teflon tape around the threads of the bleeder screw. There always seems to be an air leak around the threads and you can never bleed the brakes/clutch properly without the tape.
     
    R. J. likes this.
  7. Breeze

    Breeze Active Member

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    Also, if you can get a brake vacuum pump for bleeding brakes, it makes the job a whole lot easier. They are like $40 at an Auto parts store. Plus you can very quickly change all of the brake fluid in your bike and your cars. Just remember the teflon tape!
     
    R. J. likes this.
  8. 87kawzl

    87kawzl Well-Known Member

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    ^ what he said, bench bleed the master.

    Could try tapping the master with plastic mallet to get the fluid past the air pocket.

    Once it moves fluid, I use silicone fish tank air line from the bleed nipple into the fluid in the reservoir and a dab of high vaccum grease around the threaded portion of the bleeder.
     
  9. Breeze

    Breeze Active Member

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    Also, you have to make sure the air return hole is clear inside the Master Cylinder. If that is plugged you will also have problems.
     
  10. R. J.

    R. J. Senior Member

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  11. WillyD

    WillyD Senior Member

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    If possible and you can pressure bleed go from the bleeder and push up to the master. As stated earlier when bleeding the conventional way it is extremely important that the master is bled first. Tiny amount of air in the passages in the master and it will NOT move the fluid.
     
  12. LT132

    LT132 New Member

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    Ok, so after disassembling and reassembling the master 3x, using a syringe to reverse bleed from the slave, and taking all of your good advice into account, my brother very slightly turned the handle bars and several big air bubbles released from the master and... the clutch is bled. Thanks everyone
     

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