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Front Brake Drag

Discussion in 'XJ Technical Chat' started by B1Blommer, Oct 24, 2008.

  1. B1Blommer

    B1Blommer New Member

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    I had my XJ700XS up on a jack to replace the front tire. I noticed when I put the front rim back on, that there is considerable drag on the front brakes. It will only free spin about 3/4 of a turn. Is this normal or do I have a problem with my calipers/master cylinder? I know some drag is expected, but this seem excessive. I drove it around the block a few times and put it back on the jack and the condition persists. It didn't seem to hurt the performace, but the 700cc engine can clearly compensate for the drag.
     
    B1Blommer, Oct 24, 2008
    #1
  2. bill

    bill Active Member

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    Not normal. Check your rotor is it always the same spot? I know you just got tires I assume the shop would have said something if the wheel was bent.

    Check your reassembly - make sure everything is right.

    When we gonna tune that thing?
     
    bill, Oct 24, 2008
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  3. argh1961

    argh1961 Member

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    B1, I had the same issue earlier this year. Basically, I had to rebuild the caliper with new seals. Also rebuilt the master cylinder at the same time and replaced the brakes lines with a single braided steel line. Not too hard to do, a little messy. The biggest problem I had is that the piston was pretty much siezed into the the cylinder. After several failed attempts at removal, I ended up reconnecting it to the brake line and bleeding, then used the pressure of the brake system to easily pump the piston out. Have a pail or something to catch the escaping fluid.
     
    argh1961, Oct 24, 2008
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  4. Chez

    Chez New Member

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    Hi,
    Sorry to hear youre having problems with your front wheel...

    Have had similar problems myself, BUT dont think its anything to do with the brakes or callipers.

    Once I left out the tube that runs thru the axle and caused me all sorts of problems - basically when you tighten up the axle, without the tube in place, the fork ends are either squashed together, or not close enough - either way the wheel doesnt run true and effectively you get brake "drag" as the callipers are out of alignment with the discs.

    You can also get similar problems even if the tube is still in place - check the correct torque settings for the axle nut and try spinning the wheel when lifted off the ground - usually makes some difference.

    Surprised no one else has had similar problems and really surprised that people insist on immediately stripping thier callipers for the slightest of problems!

    Hope it helps anyway >:*)

    Ride free,
    Chez

    XJ900F '91 97000miles
    XJ900F '94 6ooomiles
    Thundercat '98 5000miles
    XJR1300 '08 200miles
     
    Chez, Oct 25, 2008
    #4

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