Question about 1999 Yamaha YZF-R1

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My son has a 1999 Yamaha R1 the brakes lock up. The handle gets so tight you can't squeeze it. If I open the blead vale on the calipers on eather side, the brakes free up and work again for a short time and then freeze up again. I took the master cylinder apart did not find any thing wrong any ideals?

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  • tombones May 11, 2010

    Sounds like the brake calipers have gone bad and will not let the pressure of of the brake pads.

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What usually sets the pads back from the disc is a thing called runout.Discs are not perfect in the way they run.Apply the brakes,let them go and the offset or not quite true disc,moves the pads apart.This pushes the pads apart at the highpoint of the offset.Without this,brakepads would sit there all day and overheat.Yours sound like they are not releasing pressure.This is the master cylinder.There is only 2 things in brakes,master and slave cylinders.Please get the master cyl. checked.I hope this is without abs brakes.Hope this helps

Posted on Sep 27, 2009

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