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Old 11-16-2010, 12:37 PM   #1
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Master Cylinder rebuild kit?

So my cousin has a '06 636 that needs the front brakes bled each time he wants to ride. Poking around online and the common problem is the MC needs to be replaced. I was wondering if anyone knows of a rebuild kit that can be found (all I see online is for the prev. years) to save him some money and still fix the problem. I guess also is there a way to test that the MC is actually the problem? When he bleeds the brakes he's good (can actually use the front brakes) until he puts the bike away, but the next time he goes to ride it's time to bleed em again.

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Old 11-16-2010, 07:37 PM   #2
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zip a zip tie around the lever/bars overnight, in the morning see if it still has pressure. if not, it is either leaking internally or externally (obviously), look at all of the crush washers/banjo bolts/bleeders/caliper pistons for fluid escaping.

if it still has pressure, look at the master cyl feed line (from the fluid cup), where it connects to the master cyl, there is an o-ring around the fitting. a lot of times, that o-ring will get dried out and allow the master to suck air.
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Old 11-16-2010, 09:04 PM   #3
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The Nissin master cylinders on the Kawis and Suzukis are prone to going out. You can rebuild them but the problem will return over time.
A better bet is to get a cast Brembo unit off an '04 up R1 or "06 up R6.
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