2nd Gen Non-Engine/Transmission combination valve troubleshooting

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I am trying to troubleshoot an on going brake problem and the only two things left are the combination valve and the master cylinder.



The manual says that a stem should move in and out of the combination valve, is this that rubber thing on the front?



Anyone know where you can get a replcement or is this a dealer only item?



thanks

 

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Anyone got an idea?

 

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Finally got a chance to look at it. It is the rubber thing on the end that moves in and out when you push the brake pedal. And it is a dealer item only or a junkyard item.



Haven't got a price yet.