gs850g rear master cylinder rebuild

[ardbeglily]

I have done the search but can't find anything really specific on the rebuild. I have the outer seal, the circlip and the rod off, but have no idea how to get to the spring and seals inside. I looked on the microfiche and they do come out, but I do not want to force any thing. All help greatly appreciated. Thanks
p.s. this is my first time doing this, so be patient.

[rustybronco]

Nothing holds the piston, cup and spring in. if it doesn't come out by rapping it on a wooden board then more than likely the piston is corroded to the bore.

do you have a rebuild kit for it, or is this a take apart, clean and reassemble project?

[Guest]

remove the banjo bolt from the opposite end of the MC, then simply push the insides out using a small screwdriver or similer. shouldn't be stuck very hard...

there's a piston/seal assy & spring/rubber cap in there.

[rustybronco]

remove the banjo bolt from the opposite end of the MC, then simply push the insides out using a small screwdriver or similer.

Be careful, there is a rubber check valve at the banjo bolt end of the spring.

[ardbeglily]

thanks

Thank you Rustybronco, I have a rebuild kit, but having read your reply and looked at the piece, I think you are correct. I sprayed some stuff in there to try to unfreeze it. When it was on the bike and I pushed on the pedal there was a noise like some fluid was moving inside, so I suspect (I really hope and pray) it may not be too badly frozen. Any other suggestions would be greatly appreciated. Thank you

[rustybronco]

Put a little penetrating oil around the area where the piston meets the bore, slightly tap it back and forth with a wooden dowel/stick on the piston end and a small punch/screwdriver from the banjo bolt end. eventually it will loosen and come out.

I just did my '80 last Sunday that was stuck bad and damaged the check valve, thank God I had a spare from a Honda.

[ardbeglily]

mission accomplished

Thanks to all, great advise as always. Now for the rebuild. Tom