On 22 Oct, 19:05, "Tim Mara" wrote:
there is now a new bleeder system from TOST
for details please seehttp://www.wingsandwheels.com/page32.htm
tim
Please visit the Wings & Wheels website atwww.wingsandwheels.com
"Mike McCarron" wrote in message
...
How can one tell where to position the lever? *Half way through it's total
travel or some other location?
MC
At 16:33 22 October 2008, Uncle Fuzzy wrote:
On Oct 22, 8:22=A0am, Uncle Fuzzy *wrote:
On Oct 22, 8:01=A0am, "bumper" *wrote:
Yup, what JJ said. The "red stuff" is Mil Spec 5606 hydraulic oil
and
i=
s
compatible with Buna-N O-rings and seals. It's also commonly used
in
th=
e USA
for most small GA aircraft.
DOT automotive brake fluid, the "clear stuff", most often
glycol-ether
based, and is compatible with EPDM rubber seals.
If you are switching parts from one fluid to the other, you gotta
chang=
e the
rubber stuff.
bumper
"JJ Sinclair" *wrote in message
...=
..
Why didn't it work, Mike? Hydraulics are hydraulics, the Clevland
brake slave cylinder doesn't know (or care) where that pressure
is
coming from? Make sure you have compatible seals. What type fluid
doe=
s
BMW use? Can't mix the red stuff with the clear stuff.
JJ
Mike McCarron wrote:
JJ,
I did purchase a master cylinder from a BMW motorcycle dealer
that
d=
id
fit
in place. =A0Unfortunately it did not function properly. =A0It
was
p=
roperly
bled and all but it did not work. =A0I don't know what to do
next.
=
=A0There
must be at least 100 of these gliders in the US that will need a
mas=
ter
cylinder replacement in the future. =A0I don't see how we can
junk
a=
$30K
glider for lack of a functioning master cylinder.
Thanks for your comment,
MC
At 13:41 22 October 2008, JJ Sinclair wrote:
If memory serves me, its a motorcycle master cylinder BMW? I
believ=
e
they cut it down from the original, good luck getting your
inspecto=
r
to sign off on installing it!
JJ
Mike McCarron wrote:
My club has a 1983 Grob 103 Twin II that needs a new master
cylin=
der.
Over
the years the Grob factory has made changes to the system
without=
full
documentation and as a result the US distributor can not be
sure
=
of
how
I
go about purchasing the proper master cylinder for this
glider.
If you or anyone you know has replaced the master cylinder on
a
vintage
Grob 103 Twin II recently I would appreciate your input on
where
=
I
might
purchase the correct system.
Thank you,
Mike- Hide quoted text -
- Show quoted text -
In our club Grob 103, the master cylinder is a Magura motorcycle front
brake master cylinder. =A0Magura makes parts for a bunch of bikes, and
for the aftermarket. Motorcycle front brake master cylinders come in a
variety of piston diameters. =A0They are also somewhat weird to bleed.
They won't develop pressure unless almost all of the air is bled out
of the system. =A0"Pumping" one endlessly has no effect. =A0On a
bike,
on=
e
trick is to zip tie the handle so that the lever is halfway to the
grip, crack the bleeder on the caliper (with a tube on it to direct
the drainage), and walk away for a couple hours and let gravity do
some work for you. =A0Much quicker is to zip tie the lever halfway,
and
use a small vacuum pump rig to PULL the fluid through. =A0Once most of
the air is gone, you should be able to develop some pressure to
complete the bleeding in the normal manner. =A0YES to DOT 3/4. =A0NO
to
Mil Spec 5606 hydraulic oil. =A0As an experiment, I tossed some
motorcycle brake bits in a jar of 5606. =A0They turned into something
other than brake bits pretty quickly.- Hide quoted text -
- Show quoted text -
Clarification on the quicker way to purge the air out: *Zip tie the
lever at half travel, use a vacuum pump ON THE CALIPER BLEEDER to pull
brake fluid through. *Hope this helps- Hide quoted text -
One possibly non-obvious thing is that if there are flexible
rubber hoses in the pressure side of the system they you
need to check that they are servicable.
With age they lose stiffness and expand sufficiently under
pressure such that the brakes do not work. Indistinguisable
symptoms from air in the system.
If you have one that is 30 years old then I would just get a new one.
I don't suppose that the fancy teflon ones suffer from this.
http://www.goodridge.co.uk/buy-goodridge-hoses.htm