Question about 2000 KTM 640 LC4

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Rear brake lock up on KTM LC4

My 2000 LC4 sat for a year while I vacationed in the desert. After rebuilding the carberator I got it running. During my first ride (about 5 miles) the rear brakes locked up. I could not move the wheel until I removed the line to the rear hub. I assume that there must be a problem with the master cylinder. Do you have any advise on what could be wrong and possible fixes? Can this type of repair be done without special tools?


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  • magnumpi980 Jun 20, 2009

    The disk brakes were completely locked up. It was as if I was pushing on the brake pedal hard. When I removed the

    hydraulic hose to the brake they unlocked and I could ride it home.

  • bozcro
    bozcro May 11, 2010

    a lock up would be caused by the caliper i think as you mentioned a hub, which would be a drum brake.



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My 2000 lc4 did the same thing. it was sitting for a long time (i bought it with 300 miles, and 8 years old) i tried adjustments, and everything else, which didn't help, but ended up rebuilding the master cylinder, and that fixed it. could see anything wrong with it, but replaced all the internal parts anyway. i've now put 2000 miles on with no more problems.

Posted on Aug 05, 2009

  • delhess Aug 14, 2009

    another problem could be your pedal adjustment. if there is any drag on your brake when not using it, there will be a little friction which will in start to heat up your caliper as you ride. as your caliper gets hot, the fluid in the caliper an line will heat and expand, causing the brake to push harder, even though you are not touching it. if the bike works fine when cold, but gets extremely tight after a little riding, this could be your problem. to fix it, make sure there is enough free play in your brake pedal, so there is no drag whatsoever on your rear wheel.


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Ihave a 2000 fxsts harley my rear wheel locked up the trany was replaced ran on a dino brought home rode 50 feet locked up again

Posted on Jun 22, 2009

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When was the last time you checked/changed your rear brake pads? This isn't really easy to miss, with the reduced braking power and different sound when braking, but if you have worn the pads so much, that the pad's metal surface (or even the cylinder itself) has gone out and stuck into disc, you could have a problem... For starters, remove your brake caliper, and have a look inside, this can be done easily.

Posted on Jun 20, 2009

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