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Old 18-12-2016
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Piston not working

Hey guys just changing the front brake pads on wr250 f 2007 all good until I noticed that the bottom piston doesn't seem to be working, won't come in or go out, completely no idea what's going on can anybody point me in the right direction to fix.

Cheers
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Old 18-12-2016
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At the very least it will need new seals,you can buy a rebuild kit quite cheaply which will have seals and everything else you will need,you can also give the piston a light sand,plenty of you tube videos on how to pop out the pistons and do the rebuild,that and fresh fluid
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Old 18-12-2016
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Quote:
Originally Posted by kawasaki glenn View Post
At the very least it will need new seals,you can buy a rebuild kit quite cheaply which will have seals and everything else you will need,you can also give the piston a light sand,plenty of you tube videos on how to pop out the pistons and do the rebuild,that and fresh fluid
thanks glenn can it be ridden before this is done or should i get straight onto it?
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Old 18-12-2016
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Don't ride it, with only one piston active you might warp the calliper casting. Seen plenty of bikes with keystoned pads from warped callipers.
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Old 18-12-2016
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thanks for the advice nutty will fix it before i ride it.
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Old 18-12-2016
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hate to sound stupid but can you tell me what i need to order?
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Old 18-12-2016
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also if the pistons look crap should i replace and if so what again do i order?
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Old 18-12-2016
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You need to order one of these...

https://www.rockymountainatvmc.com/p...ild-Kit?v=5640

whilst you are at it you might as well get the master cylinder rebuild kit as well

https://www.rockymountainatvmc.com/p...ild-Kit?v=5640

You might even be able to find the kits on mxstore.com.au as well,prices compare quite fairly,I ordered a linkage rebuild kit from mxstore and was bang on the same as getting it from the states

If your piston is stuffed then you can order them from your yami dealer,again the you tube vids can be quite useful and most run through what to do with sanding the piston etc,it shouldn't be stuffed unless your bike has seen no maintenance for long periods of time

It's not very hard at all to rebuild the caliper,just need to be careful when popping out the piston,youtube is your friend here,also grease the brake pin and the rubber bushes and pin they slide on,this will keep the caliper working freely after you have rebuilt it,neglecting to do that will just cause you problems further on down the track
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Old 18-12-2016
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thanks for your help glenn. cheers.
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Old 18-12-2016
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Quote:
Originally Posted by shooter934 View Post
hate to sound stupid but can you tell me what i need to order?
sounds like you need new piston seals, and maybe one new piston, you really need to pull it apart and check for damage, if one piston has seized or is jammed it may not be usable once you get it out.

if you pump the brakes the top piston will pop out.

i would try to carefully twist the bottom one and see if you can free it up before removing the top one, you might be able to free it up and get it working, but it's not likely to be trouble free.

it's a simple system

but worst case, could be you have damaged the caliper housing.
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