Dragging Bird Brakes
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  • 1 Post By TheDuck
  • 1 Post By biker1bmw

Thread: Dragging Bird Brakes

  1. #1

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    37165
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    01' 1100xx blackbird, 04' ktm 950 adv, 72' triumph
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    Dragging Bird Brakes

    I have a 01 bird that was sitting garaged for at least 5 years, I have it running well but the front and rear brakes drag after brakes are applied, meaning they will not release, bike only has 17k on the clock and is in excellent condition.


    I installed new pads front and rear so I know the pistons move freely, I'm thinking the PCV proportioning valve may be the cause from sitting so long as problem affects both front and rear.

    I can release the brakes by opening the rear bleed screw but it locks up again when brake is applied.

    Has any one experienced this problem and if so what was your fix? Is the PCV rebuild able (don't want to spend $300+ for a new oem one) also do not want to De-link brakes.

    I will do a complete flush and bleed with new fluid and hope problem is resolved but not hopeful.

    Any suggestions are appreciated, or sources for an good used PCV

    thanks

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  3. #2
    Play, it makes life fun
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    Re: Dragging Bird Brakes

    I have this problem on another bike and have looked at threads here and other forums. So far I have read it is most likely in your SMC on the front left fork. There is a small return line orifice in there that can get sludge built up and clogs it. This causes the brakes not to release. Hope this helps you. I am about to do a complete fluid flush on mine. Then go after this exact problem on my 84 Honda GL1200 Goldwing.

    Sent from my SM-N960U using Tapatalk
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  4. #3
    Supercharged Mod
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    Re: Dragging Bird Brakes

    The secondary master cylinder is usually the cause of drag on the rear wheel. Either the pivots are not free moving or there is crud blocking the gauze/ports.
    Drag on the front is normally sticking pistons be that the ones operated by the lever or the pedal. A good clean usually works unless the seals have gone hard.
    I have experienced 'back pressure' causing issues at the front but that was a one off.

    I don't anticipate the PCV to be the cause of your issues, they are very robust and in spite of tending Birds for 20 years now I can't remember one being the cause of problems similar to yours.

    Be aware that when you flush the system that there are 'knooks and crannies' that old fluid loves to stay trapped in. Manually pump the secondary cylinder and be prepared to think the job is completed only for a large slug of black/brown mess to exit the system!
    XXGUY likes this.
    Full of Hot air? Intercool yourself............ you know it makes sense

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  6. #4

    Member #
    37165
    Bike(s)
    01' 1100xx blackbird, 04' ktm 950 adv, 72' triumph
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    Re: Dragging Bird Brakes

    thanks for the info I will keep you posted,
    XXGUY likes this.

  7. #5

    Member #
    4815
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    2000 CBR xx, 04 ST1300, 07 WeeStrom
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    Re: Dragging Bird Brakes

    The ST1300 has an almost identical braking system. There is lots of info regarding dragging brakes and the solutions.

    Check this forum

    https://www.st-owners.com/forums/for...00-brakes.456/

    There is one inmate on the ST forum that is a guru regarding brakes. His forum handle is "Igofar". He has helped countless people with brake problems. Wouldn't hurt to drop him a PM or even call him.


 

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