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Brakes catching

Discussion in 'XJ Technical Chat' started by Evan Hawtrey, Apr 5, 2020.

  1. Evan Hawtrey

    Evan Hawtrey Member

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    So it’s been awhile but I have no ideas.. my front brakes catch.. if I crack open the bleeder they work perfect again.. I replaced the master with new old stock.. I replaced brake lines.. rebuilt calipers.. bled them .. they do this intermittently .. any ideas?
     
    Evan Hawtrey, Apr 5, 2020
    #1
  2. Polock

    Polock Well-Known Member

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    brakes are like toilet handles, you really want them to work every time.
    all i can think of is the small pressure relief hole in the mc, plugged or the plunger seal isn't going back far enough to open it.
    with the top off the mc, work the lever, you should see the signs of fluid shooting up from that tiny hole. cover your tank, sometimes it gets messy
     
    Polock, Apr 6, 2020
    #2
    hogfiddles likes this.
  3. tabaka45

    tabaka45 Well-Known Member

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    I'm with Polock, something is amiss in the master cylinder. I would take it apart just as if I were rebuilding an old one. Even though it is "new" it's still "old."
     
    tabaka45, Apr 6, 2020
    #3
    hogfiddles likes this.
  4. XJ550H

    XJ550H Well-Known Member Premium Member

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    NOS is just what it is old stock it sat on a counter for a long time. May need to be rebuilt.
    its as old as 37 years.
     
    XJ550H, Apr 7, 2020
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    hogfiddles likes this.
  5. Evan Hawtrey

    Evan Hawtrey Member

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    So I brought it in to a bike repair guy Bc I was getting nowhere .. he made the hole slightly bigger in the master cylinder and the brakes work perfect now...‍♂️
     
    Evan Hawtrey, Apr 18, 2020
    #5
  6. Timbox

    Timbox Well-Known Member Premium Member

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    "made the hole slightly bigger" means he cleaned it out with some wire to make flow better. I would hate to think used a drill bit to make bigger. Anyway, I am glad you have it fixed and are able to get out in our WI weather and wind to ride.
     
    Timbox, Apr 19, 2020
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    Polock likes this.
  7. XJ550H

    XJ550H Well-Known Member Premium Member

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    I just wonder where the gunky cleaned out ended up going
     
    XJ550H, Apr 19, 2020
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