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Lost my front brake!!!

Discussion in 'XJ Technical Chat' started by Ravenz07, Jul 23, 2010.

  1. Ravenz07

    Ravenz07 Member

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    After taking the Maxim to a welder to weld on a kickstand mount, I realized the brake didnt feel as good as it should. Today I decided to change the brake fluid and bleed out the system, thats all it felt it really needed. When I began bleeding it and pumping up the brake, I soon found that the brake was not pumping up at all! Anyone have suggestions as to what it may be?
     
  2. wizard

    wizard Active Member

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    Worn rubber in the master cylinder.
     
  3. RickCoMatic

    RickCoMatic Well-Known Member

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    Remove the Master Cylinder Cover.
    Level the Master Cylinder.
    Squeeze the Brake Lever and watch the show.

    If Brake Fluid shoots upward like Old Faithful, ... you have a Main Seal failure.
    You can stick a Kit in there if the Cylinder isn't pitted.
    If the Cylinder is spotted with Foreign Matter build-up ... remove the Crud and Clean the Bore before installing the Kit.

    Examine the whole system for a leak before ordering parts.
     
  4. Ravenz07

    Ravenz07 Member

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    Any idea how much a kit might cost?
     
  5. Desinger_Mike

    Desinger_Mike Member

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    These things are a bear to bleed.
    You almost need a vacuum bleeder to get the job done quickly otherwise you can sit and squeeze til the cows come home.
    The local autoparts store should have something on the shelf similar to this:
    http://www.sears.com/shc/s/p_10153_1260 ... ockType=G1

    I'm not saying your master cylinder doesn't need help...but this is by far the quickest way to bleed them.
     
  6. Ravenz07

    Ravenz07 Member

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    Is it possible that I havent pumped it up enough? I didnt really spend too long on it, probably 10 squeezes or less and it didnt get better. I have bleed it before without problems. But that was over 3 years ago.
     
  7. RickCoMatic

    RickCoMatic Well-Known Member

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    A "Healthy" Master Cylinder will usually do two things very well:

    1) "Move" Brake Fluid. If the Seals are working right, ... Brale Fluid is going to get pumped-out of that Master Cylinder.
    The Brake Fluid will --> Move ... toward the Bleeder exit.

    2) Develop Hydraulic Pressure and force Air and Fluid OUT of the System.

    You should be able to attach a One-way Valve or Bleeder to the Caliper and pump the Fluid in the Master Cylinder Reservoir OUT by squeezing the Brake Lever.

    Once all the AIR is expelled ... the Pressure should begin to develop almost immediately.
     
  8. Ravenz07

    Ravenz07 Member

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    Well there must have been a lot of air in the system. I pumped it up and some and bled it a few more times. Worked out fine!
     
  9. RickCoMatic

    RickCoMatic Well-Known Member

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    I use a old "One-man Bleeder".
    It has a one-way Calve at the end of a vinyl hose.

    I put Teflon Tape on the Bleed Screws to keep them Air Tight.
    I remove all the Fluid from the Master with a Bubble Syringe and Clean the whole Master, Gasket, Cover and Window with Brake Kleen.

    Fill-up the Master 3/4 of the way.
    Pump the System through the One-way Bleeder submerged in Brake Fluid.

    Once what comes out is as cleann as going in,.... I get the Bleeder closes and do a Pressure Pump a couple of times with the Bleeder closed during the pump-up and Open for the purge and wrap it up.
     

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