GS650G brakes will not pump up...

[esmithers]

I cant seem to get the rear brakes to pump up. i have vacuum the system and still will not pump up. i remove the banjo bolt from the rear caliper and when i pump the brakes i can feel it suck on my finger but does not have firm pressure pushing my finger away to release the fluid.

Do you have any suggestions. i rebuilt the unit and it was not even getting the fluid past the most front cap/seal.. i put the original ones back in and it allows the fluid to come out but there is no strong pressure.

please let me what you think.. thanks.

[Nessism]

Master cylinder must be dirty, or assembled incorrectly.

[esmithers]

the M/C is clean inside and out. both the new and old sets of seals and springs are in great shape.

i have looked at the Microfishe files and it shows the spring with the main shaft. but does not have the rubber cap/seal shown.

tomorrow i will will remove the M/C from the bike again and remove that seal and see how it works.

the cylinder and smooth as a babies butt. there are no hang up.

I have rebuilt plenty of these things before but this thing has me stumped. I dont know what could be causing it to not have the build-up of pressure.

if you or anyone have any suggestions beside clean the cylinder and make sure its installed correctly please let me know. this thing is clean enough to eat out and off of. and its being rebuilt correctly.

Additionally i will try and remove bleeder valve and fill with brake fluid and see if i can get some movement from the calipers. but inorder for these things to move there needs to be adequate pressure. Hope to get this figured out soon.

[esmithers]

UPDATE:

Well Nissim was correct, i had infact incorrectly had it installed. i went with how it dis-assembled. this goes to show that attention to details is very important.

that being said.. i have brakes on this bike all around and they are working.. now just a matter of getting the carbs back from Chef and get the carbs sync'ed to the motor and take it for a spin and see how she acts.