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2015 300 Front Brake Issues


hannon
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anyone having issues with the front brake?

randomly the lever will one minute act as if it is working where it has been adjusted to and then the next minute the lever acts like it has been adjusted further in towards the bars

the disc is perfect straight

fluid level is full

everything seems to be normal

 

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Mine did exactly the same thing ('15 Sherco 300). I never really dug into it to figure it out, but yup... exactly as you describe. Bled it a few times, no change.

 

I have a hard time believing it needed a rebuild... especially since it did it from brand new.

Edited by heffergm
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That I can't argue with... my Beta master cylinder leaked from the off.

 

If they're like this from new though, what's the point of a rebuild kit? Presumably it's made with exactly the same crap components, so I wouldn't expect it to solve anything.

Edited by heffergm
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Overhauled mine with a new seal kit and piston 2 weeks ago, the bike has 8 months regular use. I was unable to see any wear or damage on the originals and no sharp edges on the cylinder ports. I don't hold out much hope of long lasting success.

It would be different scenario if these were new cars etc.

Edited by sirdabalot
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Oh, the joys of reliable hydraulics!

Two usual causes.

1) Machining crap left in after manufacture, this is fine sharp swarf and it cuts the seals or wedges in the lips causing leakage. Usually  a good flush out and a seal change cures this.

2) A poor finish on the cylinder bores and sharp edges / protruding burrs on the fluid ports. Careful work with de burring tools the lapping out the bores with 1200 or 1500 grade wet and dry, then fitting new seals usually cures this.

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  • 3 weeks later...

The bike did this when I first purchased it July 2015.  The pads are near new.

 

Last week I purchased a Master cylinder rebuild kit and installed it.  The old piston and seals looked great.  Nothing visible in the bore, but still cleaned it up as best as possible.  New piston was different than original.  Bled the brakes and I still have the problem.  Sometimes the lever is where it is adjusted to and sometimes the lever actuates closer to the grip.  Seems to be happening after a big zap or bouncing down hill.

 

Any other ideas?

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Are your wheel bearings ok, sometimes if there is play in the bearings the disk will push the pads back further and the cause you to have a different position on the lever until you pump the lever and then it returns to the original position!

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