Stuck Rear Master Brake Cyl Yam RD

Looks like you have it assembled correctly. Can only re-iterate the bleeding procedure. If the front seal is working properly, it should work.

1) compress piston.
2) seal outlet
3) release piston
4) release seal on outlet
5) repeat

This should draw fluid into the space between the two seals and then into the space above the front seal. Even if the front seal is not working at all - like your old bad seal or even missing - you should draw fluid into the bore. Releasing the piston increases the trapped volume, so either air or fluid has to fill the increase. If the inlet hose has fluid in it and it does not fill with fluid, the air has to come in from somewhere else. You know the rear seal works, so the above procedure has to work unless there is some huge air leak. Your finger is replacing the one way valve action usually provided by the front seal. If the reverse problem has occurred, i.e. the seal is sealing tight in both directions, sealing the outlet after the piston is compressed should keep the piston from returning all the way to the extended position due to the vacuum.

Hopefully with the above information you can determine what the problem is. With no line on the master and using your finger, the master should fill very quickly and completely in just a few strokes.
 
So great news guys...

I called the PO of my RD,who is pretty a geek when it comes to yamaha 2 strokes.

He sent me an used master for a reasonable price,tested it before i fitted it.

The only thing i had to modify:
Had to grind off the points for the brake light (this pump was off an earlier model which had them integrated on the pump),cuz it would collide with the CDI.

Seriously,It took me 5mins to bleed the new system....

If the new master will start leeking sometine i will not bother rebuilding it the the yambits parts.i will sent it to nsr mike...he takes 15 pouns per master and sends back a perfectly refurbished one.

Didnt have the time to test the brakes yet but the seem to be really sensitive...maybe i need to play a little bit with the actuator height...

Thank you guys for your help!!
 

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Good to see you have things sorted out. Now you just have to start her up - so you can look forward to spring!
 
^+1!!

Thanks again...

The way it looks in austria right now as if i still got time to sort out some details :)
 

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