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Bleeding the XJ750 Seca Front Brakes

Discussion in 'XJ DIY How-To Instructions' started by k-moe, Jun 30, 2019.

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Are these the most difficult XJ brakes to bleed properly?

  1. Yes

    3 vote(s)
    60.0%
  2. Yes

    2 vote(s)
    40.0%
  1. k-moe

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

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    I reference this often enough that it's probably past-time to turn it into a standalone thread.

    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 similar 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.
     
  2. Franz

    Franz Well-Known Member

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    Sander usage same principle to compact poured concrete with construction plant. Need to try that next time l bleed brakes.
     
  3. k-moe

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

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    Yep. Brings the air bubbles to the surface so they can pop.
     
  4. raskal

    raskal Active Member

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    I think step 10 requires sub-sections;

    10.1 Video yourself using a sander on your bike
    10.2 upload to Youtube, and post link
     
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  5. k-moe

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

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    So I have had a little of my favorite brown liquid. Deleted two posts because I remembered this is a family-friendly forum.
    We went a bit beyond the usual double-entendre.

    It was good though. Should have been here to see it.
     
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  6. Franz

    Franz Well-Known Member

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    Funny.
     
  7. Franz

    Franz Well-Known Member

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    Getting a little Brahms and Liszt with that brown liquid lol.
     

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