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Please Help With Bleeding Brakes

Discussion in 'XJ Technical Chat' started by jag3, Sep 9, 2008.

  1. jag3

    jag3 Member

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    I have an 83 XJ750K Maxim and I just replaced the fork seals, rebuilt my Master Cylinder and my Calipers and added brake fluid. I don't have a Mity-Vac so I saw a thread that someone pumped the fluid up through the bleeder valves so I did it that way. After the fluid was all in I bleed the brakes the manual way, a little air came out so I did this several times until I didn't see any more bubbles. The problem is I still have no brakes and what seems to be a soft brake lever. I left the cover off the reservior to see if any fluid was going down or if any bubbles would come up through there but nothing (I did clean the reservior and little holes). Also, since I did my forks I just left the calipers hanging loose. While squeezing the brake lever I can see the caliper piston moving in and out but only ever so slightly, I would actually think the piston would pop out since there's nothing holding it in. What could I have done wrong or what do I need to do?
    Please help, this is taking way to long to do.
    Thanks :? :cry: :x
     
  2. osage

    osage Member

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    if the capliper is still off the rotor, you will not have anything for the pads to push against.....so you will have a soft brake lever.
    mount the calipers to the rotor with the pads in and then bleed them again, should get pressure right away.
     
  3. RickCoMatic

    RickCoMatic Well-Known Member

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    You need to mount the Calipers so that the BLEEDING process will force the Piston out to contact the Rotor.
    When you have it so the Piston cannot move; the fluid in the system will be forced out the Bleed Nipple.

    If you keep applying pressure to the system with the Piston not secured from travel ... either you will not build-up pressure ... or, you'll force the Piston right out of the Caliper and have to start from scratch.

    I use a simple and inexpensive little device available at the Auto Parts Store.
    A "One-Man" Bleeder.
    It's a hose with a One-way Valve at the end.
    As the Brake Fluid passes through the Valve the valve closes allowing the Fluid to move and force-out any air in the system.

    Simple, effective and not expensive.
     
  4. jag3

    jag3 Member

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    Thanks for the advice. If I mount the caliper and it builds up pressure do you think it will straighten our the caliper piston because it's slightly crooked?
     
  5. Polock

    Polock Well-Known Member

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    if you put the caliper on it positions the bleed nipple to let the air out
     
  6. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    Try it and see. It should.
     

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