Bleeding Rear Brake Issues '80 850

[hotspur]

Hey Fellas,
1980 GS850G
I was refreshing the brake fluid in both systems. Did the front no problems. Started on the rear, took off the mc cap, opened the bleed nipple, pressed down on the pedal. Small amount of fluid came out then nothing. Now no pressure on pedal and cannot get out any of the fluid. have tried both nipples. Any ideas what could be wrong?

Cheers

[Nessism]

Master cylinder piston stuck in the down position? If so, sounds like time to take it apart and clean/rebuild.

[txironhead]

Yep, time for a complete teardown and rebuild of the rear brake system!

It's not as bad as it sounds, can usually be done in an afternoon. You may not even need to replace anything but if you want to be extra sure you can buy rebuild kits for the caliper and master cylinder. I just rebuilt the rear brakes on my nephew's bike and didn't need anything but some parts cleaner and fresh brake fluid. Blow compressed air through all of the openings and the brake line to remove all the crud. Hydraulic fluid (brake fluid) absorbs moisture, which is the main reason brake systems gum up over time.

[Suzuki mad]

Have you had the rubber caps on the bleed nipples?

If not remove the nipples and clean them out of all the old crud. If thats not the case it sounds like the master cylinder has a problem or you have a build up of rubbish in the brake chambers. If you removed one of the nipples completely them pumped any large objects would come out with the fluid.

Have you topped up the resevior or let it run dry as this may also cause the same problem like an air leak?

Suzuki mad.