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hot front disc.

Discussion in 'XJ Technical Chat' started by leaningleft, May 2, 2008.

  1. leaningleft

    leaningleft Member

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    Don't know if i'm just being paranoid.Had some stiff front brake troubles earlyer in the year found it was just a winters rust on the caliper keeping it from opening after braking.Went for a short ride to work and back today and doing a circle check after found my front disc to be very hot .not being one to lay hard on the brakes got me a bit worried about this.Or this to be expected
     
    leaningleft, May 2, 2008
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  2. ArizonaSteve

    ArizonaSteve Member

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    Your brake shouldn't be dragging since it is supposed to retract the pistons pressing against the pads when they aren't applied. You probably need to take the calipers apart and clean out the rust and corrosion so they don't stick and clean the crud out of the master cylinder then flush the lines out, put in new fluid and bleed it.
     
    ArizonaSteve, May 2, 2008
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  3. RickCoMatic

    RickCoMatic Well-Known Member

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    Do as Steve suggests.
    You aren't far from having a Caliper freeze-up on you.

    You have to clean-out the two channels that the Caliper Piston Seals are in.
    Brake Fluid, moisture, dust and grime form on the Inside Diameter of those two locating channels.

    After time, the stuff gets as hard as any epoxy and needs to be scraped off and cleaned away.

    If you are dragging your brakes and heating-up a Rotor ... you need to do it right away of the next stop is warped Rotor and that;s no fun.
     
    RickCoMatic, May 2, 2008
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  4. adrian1

    adrian1 Active Member

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    Having recently changed the M/C and pads, I now have a similar problem....a squeak when wheeling the bike by hand. Further inspection reveals 2 warped discs! However with wheel removed, pads do move in and retract however they bind on the warped raised part of the discs. When it goes past the high spots, the pads can rattle freely again. Will this be solved when I replace the discs or.....?
     
    adrian1, Sep 26, 2011
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  5. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    For the OP, what you are experiencing is a caliper that's not free to move in relation to its holding block, plus as Rick said is in need of rebuilding.

    It's not a difficult job, just a pain.

    Adrian, your issue sounds primarily like warped discs; however if they warped from overheating, you don't want to warp the new ones.

    Both you guys need to rebuild your calipers.

    And replace the original brake lines if you haven't already. They were supposed to last 4 years. Upgrade to stainless in the process.
     
    bigfitz52, Sep 27, 2011
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