Help finding instructions on rebuilding Master Cylinder

I have a 1974 R90S, after letting it sit for some time 2 years, I went to clean it up and service it. I noticed that the front brake lever was completely soft. I took the tank off and found that the reservoir is empty. I removed the Master Cylinder and I have ordered a rebuild kit.

I noticed in one of the threads I found that there is reference to the O rings that seal the tank to the Master Cylinder do not come with the rebuild kit. Is that correct?

Thank you for any help you can provide.

About the only thing I can think of is this tip:

https://picasaweb.google.com/104908...directlink&gsessionid=Bi1vaeBkyDp0QNLajzHsew#

I would think that any Clymers or Haynes should be good enough to get you going on this project.

I rebuilt the master cylinder on my 1978 R80/7 and all the necessary parts were in the kit. It was easy, and I am at best a B+ mechanic. Would have been easier if I had a third hand or a vise, though...

Once you take the unit apart you will know the size of the O Ring you need. Lowes plumbing dept has most sizes. Try for the OD and if necessary a little thicker will be OK.