Maintenance & Technical > KX250 / KX125

Rear breaks keep locking up.....

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KX500freak:

--- Quote from: joetaco87 on May 22, 2009, 02:25:59 AM ---Well the title says it.  After about an hour or so of riding i notice i get less and less play with the rear break pedal and eventually they lock up completely.  I have to loosen the bleeder screw to relieve the pressure.  My first thought was there was too much break fluid  in the resivoir but I wont know till I ride it again.  Im just looking for anyones input or if anyone else has experienced this kind of problem before.

--- End quote ---


i had an 91 k2,5

it had exactly your issues,
what i found out on my former ride ,was that the calipermounts were worn ,
also the mounting to the bike was worn,
that way it allowed the caliper to move sideways and back and forth a bit .

when you have that issue ,the pads get contact with the disk even while brake is not applied ,
due to this contact they heat up firmly ,the disc gets glowing hot ,and the oil gets to a boiling point
which cause even more pressure and further lockup

also i had my brakepedal adjusted tooo tight  :-D wich caused even a quicker lock up 


all in all   i got a good caliper and gave the pedal more freeplay ,
never had the issue again

succes

joetaco87:
kx500 - i have that exact problem where the caliper mount is really worn and has a lot of up and down play.  Not the last ride but the one before there was no way to push it out of the woods so i rode it and i had glowing hot embers flying from the caliper.  I looked at the caliper mount and its like 85$ so I figured I'd just wait till i had extra $$ to replace it.  I havn't yet taken apart the caliper to clean it, I havn't had the time.  Once i do ill let you all know how it goes.

KX500freak:
glad to hear you can use the info ,i was pretty sure cuss i had that same issue too  :| :wink:

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