Maintenance & Technical > KX250 / KX125

Front brake issue kx250

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fatdaddy:
Hey guys...last week in a HS my son's front brakes siezed up...luckily I was close with tools and took front caliper off to allow him to finish lol...i rebuilt both figuring that would solve it...the boy took went out today and the same thing happened again...im drawing a blank now....would you guys lean more towards cylinder or caliper for being the culprit

Foxx4Beaver:
When you rebuilt the caliper...did you completely tear it down, and remove the piston(s) and inspect them too?...almost
sounds like a piston might be sticking.

When you say you "rebuilt both", are you referring to rebuilding the master cylinder as well?
You could possibly have a bad brake hose/line too. For the most part, brake hoses are interchangeable, so if you have another bike, you could swap hoses and try that, before spending the money for a new one...providing the one you swap out has enough slack in it, or is at least as long as the one on the bike now.

sandblaster:
Foxx is right.
I see many brake systems that have sticky pistons.
In your service manual it recommends that you disassemble, clean, and inspect at regular intervals.
Few ever do.
What happens is you will build up goo between the two piston seals in each piston.
Then the piston tries to slide past that goo and it gets stuck.
I blow the pistons out with air, clean everything exceptionally well and pay close attention to cleaning the seals.
Your wife's tooth brush is excellent for cleaning seals.
Use a lint free rag.
Assemble with a little brake fluid.
It's amazing the difference it makes.

sandblaster:

Foxx4Beaver:

--- Quote from: sandblaster on October 16, 2017, 07:37:31 AM ---Your wife's tooth brush is excellent for cleaning seals.

--- End quote ---

Hahahaaaaaaa!! that's awesome!...thanks 'Blaster, I needed that laugh.

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