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Master Cylinder possibly shot

Discussion in 'XJ Technical Chat' started by steelrain121, Aug 10, 2020.

  1. steelrain121

    steelrain121 New Member

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    Howdy All,

    '83 XJ750 Midnight Maxim, I replaced the brake lines and calipers, just got done. Now I cannot get any pressure on the lever at all. When starting the bleed process, I am able to get fluid moving out of the bleed valves when I squeeze the lever, but simply unable to get any pressure on the brake lever at all.

    I have tried every which way of making sure there is no air in the lines, so im finally at rebuilding the master cylinder. Just wanted to see if there were any opinions on this being the root of my problems before I sink another couple hundred into it. Thanks in advance!
     
    steelrain121, Aug 10, 2020
    #1
  2. Franz

    Franz Well-Known Member

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    Same happened to me. I taped the brake lever against the handlebar overnight and that fixed it.
     
    Franz, Aug 10, 2020
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  3. JBurch

    JBurch Active Member

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    A year ago I spent hours trying to bleed the front brakes on my Seca. I came here looking for tips/tricks to bleeding out the front brakes; one member suggested pumping fluid from the calipers back up to the MC; I gave it a shot; in 5 minuets, I had a solid front brake. Give it a shot.
     
    JBurch, Aug 10, 2020
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    chacal and Franz like this.
  4. XJ550H

    XJ550H Well-Known Member Premium Member

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    XJ550H, Aug 10, 2020
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  5. steelrain121

    steelrain121 New Member

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    Did that twice, got fluid all the way down but no pressure
     
    steelrain121, Aug 10, 2020
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  6. Polock

    Polock Well-Known Member

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    all through this ordeal, keep the wheel straight ahead or there will be a bubble in the wheel cylinder
     
    Polock, Aug 11, 2020
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  7. XJ550H

    XJ550H Well-Known Member Premium Member

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    you can test the mc by inserting a plug bolt in the output port to see if it holds pressure when you squeeze the handle.
     
    XJ550H, Aug 11, 2020
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