bleeding Duo Discus brakes

On Jan 11, 12:30*am, Morgan wrote:
Looking for advice on bleeding the brakes on my Duo with the tost 30-9
caliper. *I replaced a shot bleeder valve with a new stahlbus valve,
but after futzing with the system for over an hour, I can't get the
brake to firm up to an acceptable level.

I've tried using a suction device to pull fluid (Dot 4 in the Duo)
down through the line. *I've also gone with my normal old standby of
pushing fluid up through the brake using a syringe. *The Stahlbus
valve is not working as advertised or rather the brake isn't. *The
brake doesn't seem to be creating enough pressure to overcome the
spring tension on the check valve.

The best I've been able to get to so far is a fairly spongy grip on
the rotor. Enough that turning by hand isn't possible, but it doesn't
feel like it would slow you down much when you needed it.

Basically it just doesn't feel like the master cylinder is drawing
fluid in or maybe there is a hidden air bubble.

Any thoughts from the internet hive on the quirks of this beast?
It's certainly been a much greater hassle than I expected. *I'm
guessing at this point that either there is a trick that I don't know
about or something is malfunctioning.

Thanks,

Morgan

Hi All, I have owned a lot of SH gliders and have had success doing
the following -
unbolt the brake cylinder and raise it up so there is no "loop" in the
brake line -
so the path from the brake calipers to the brake cylinder goes only
uphill -
first try to actuate the brake cylinder lever - sometimes this will
"burp" the air
bubble up into the brake cylinder - otherwise fill fluid from the
bottom nipple
until the air bubble goes into the brake cylinder reservoir - most
times the
air bubble will burp into the reservoir and no filling is necessary -
good luck,
Ralph Woodward