help,Front brake mastercylinder 81 650 maxim

I bought the kit from chacal.There are 2 rubber seals.I had the old piston to see where the seal fits.The piston is of course larger on one end.The rubber seal I had to use a pick to get it off the old piston.I did that just to see how hard it is to do.With a little manipulation and perserverance the round black rubber seal dropped down to its place just below the ledge and above the corkscrew section.sort of spiral looking.But there is another one just like it.Is it a spare or does it get used.The old piston only had one on it. the littlc round black rubber cuplooking thing.does that go over the end of the piston? that teensy hole.Man I cant imaging anything small enough for that.one strand of copper wire from a piece of bike wiring maybe.I have found nothing wrong with the master cylinder but cleaning it out and replacing the rubber parts cant hurt.the others were 37years old.I also bought the front caliper rebuild kit from chacal.I have 2 brake pads.so I am thinking after all these parts are done and the fluid is filled and properly bled with my mightyvac I should have front brakes. I cant find the radiator cap though.JK. Thanks for all input.

 

Assembly Notes:

- make sure that the internal master cylinder bore is completely clean, smooth, and free of nicks, junk, gunk, and old fluid or rubber remnants.

- lubricate the master cylinder bore and the entire piston assembly with clean brake fluid before trying to install the piston into the master cylinder bore.

- make sure that the seal lips do not "turn inside out" or "roll back" on themselves as the plunger is inserted into the m/c............a "rotating" motion of the plunger as it is being inserted can be useful in preventing such as occurrence.

- the wide end of the spring goes toward the fluid outlet port.

- the piston rubber pressure rings that goes around the plunger have an open face with a lip on it....and that lip should be oriented "in" towards the fluid outlet port.

- the metal circlip that retains the plunger in the cylinder bore goes on before the outer plunger dust boot is installed.

If you are re-using the original master cylinder components, then:

- the open end of the hat-shaped rubber cup goes over the narrow end of the spring.........and that lip should be oriented "in" towards the fluid outlet port.


Here is a good image of a correctly set-up piston, with all of the seal and spring orientation done properly (about 2/3rd's of the way down the page):

http://xjbikes.com/forums/index.php?threads/48360

 

the rebuild kit I got from chacal has a spring in it,beehive shape,i.e. larger on 1 end than the other.The master cylinder I am rebuilding had no spring.Perhaps thats why it did not work.Since there wasnt one, i am not sure where the spring goes.it might be obvious but i have never done this before.

 

Did you read the thread that Chacal linked in his post?
http://xjbikes.com/forums/index.php?threads/48360

The small end of the spring goes onto the piston as shown in that thread.

 

kmoe.i havent finished reading yet.This picture-the other small round seal goes on top of the landing now?

 

I finally scrolled down and saw the pictures.its perfectly clear now.

 

Does the master work now?

 

haven had a minute to do anything yet