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Bleeding breaks

Discussion in 'XJ DIY How-To Instructions' started by Durbz89, Apr 16, 2017.

  1. Durbz89

    Durbz89 New Member

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    I have a 81 750 seca and I'm trying to change out break fluid. Mc is full but nothing is coming out of bleeder.
     
    Durbz89, Apr 16, 2017
    #1
  2. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    What I do to bleed the system.
    1. get a large syringe from a farm store and about a foot of vinyl tubing (you can also use a 2-stroke oil mixing syringe).

    2. Cut 6" of tubing and attach that to the end of the syringe. Remove the Syringe plunger. You now have a funnel to fill the master cylinder with.

    3. Break loose all four bleed fittings (be sure to put down cat litter or drip pans).

    4. Tie the brake lever to the grip.

    5. Fill the master cylinder and syringe.

    6. Wait overnight (or at least a few hours)

    7. You should now see brake fluid coming out. Close the bleeders, and untie the brake lever.

    8. Bleed the brakes as normal, starting with the anti-dive bleeders, then the brake caliper bleeders. Remove the funnel.

    9. You aren't done yet. There will still be some air in the system. The next step cures that, no matter what method you use to fill and bleed the system.

    10. Use a vibratory sander (no sanding pad) and slowly run it along the brake lines, calipers, and distribution block from bottom to top. This will move any remaining air bubbles up into the master cylinder. Tap (or vibrate) the master cylinder to get the air bubbles to come out of the return hole. This process can also be done with a box-end wrench or other simmilar tool, and tapping the calipers and lines (it just takes longer).

    11. Do one final bleed normally, just to be certain that the calipers are fully bled.

    12. Use a flashlight to check the fuid level in the master cylinder. It should be below the fill neck. Unfortunately there is no dip-stick or sight glass on this master cylinder, so unless you empty it and measure out the fluid you will need to just eyeball it. If the fluid level is too high the brakes can hydrolock and not release.
     
    k-moe, Apr 16, 2017
    #2
  3. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Also.

    Did you rebuild the system?
    New brake lines (check the date codes), rebuilt master cylinder, rebuilt calipers, disassemble and clean at least the brake fluid side of the anti-dive?
     
    k-moe, Apr 16, 2017
    #3
  4. XJ550H

    XJ550H Well-Known Member Premium Member

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    check to make sure bleeder screw is not clogged if you used the old one
     
    XJ550H, Apr 16, 2017
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  5. Alex Rodriguez

    Alex Rodriguez Member

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    Ok guys question I rebuilt the brake system and I reverse bled the calipers by they don't seem to be clapping down what could be wrong
     
    Alex Rodriguez, Apr 24, 2017
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  6. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Push the bike forward just a little. Hit the front brake. What happens?
     
    k-moe, Apr 24, 2017
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