Question about 2004 Yamaha YZ 125

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04 Yamaha Yz 125- Rear brake Master cylinder

Hi, I have just rebuilt my son's 2004 YZ 125 rear brake master cylinder with new cylinder kits from Yamaha. WHEN I tried to bleed the system. It seem do not built up the pressure. I suspected the cylinder check valve may be defected. Or do you have sample drawing of the component construct.Thank you

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  • Murtaza Akberali  Versi
    Murtaza Akberali Versi May 11, 2010

    After overhauling the master cylinder did you try it outside i.e. before fitting it in.If yes thn how was the pressure thn?

  • tim winter May 11, 2010

    please tell me your bleeding process in detail,thanks..Tim

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Are you bleeding it by gravity (flowing down from resevior thru caliper) or forcing the fluid up thru the caliper to the resevior. The latter will get more air out in less time. Simple cheap pump kits are available at you auto dealer and u can use it on your other vehicles.

Posted on May 14, 2009

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