Gary is, of course, correct. Couple of additional things to be aware of:
Some of the earlier (pre about 1998) Cleveland caliper aluminum pistons were
not anodized, thus were subject to corrosion. This could be a problem, as
the automotive brake fluid is hygroscopic. Corrosion in the O-ring groove
and piston bore results in brake fluid contamination of the rotor and
resulting loss of brake effectiveness.

For experimental types, Sierra Brass (think that's the name) will bore out
and brass line the caliper bore, a procedure done on old Corvettes and other
cars. Cost in about $80 IIRC. Solves the leakage problem nicely.

all the best,

bumper
"Gary Evans" wrote in message
...
Tost calipers are in fact Cleveland parts with differant
O-rings and I assume the same may be true for their
master cylinders. All of this branding can get confusing.
Being U.S. manufacture replacement parts (except the
EPDM O-rings) can be obtained through retailers like
Aircraft Spruce and the special O-rings through an
industrial supplier such as MSC.

At 12:12 22 June 2006, Basil wrote:
And Duo Discus. In fact most tost calipers and all
Tost master
cylinders.

On 21 Jun 2006 17:09:09 GMT, Gary Evans
wrote:

DG also uses brake fluid with a EPDM (ethylene propylene)
O-ring at least on the 800/808. I would check the manual
for each specific model to determine which is used.
Even if you were to change the caliper O-ring to EPDM
you would still need to verify what is used for a seal
in the master cylinder and lines.

At 16:30 21 June 2006, Bumper wrote:
Another example is the Stemme S10 series, which uses
DOT fluid. Stemme uses
a Cleveland 300 caliper with the seals changed from
Buna-N to EPDM rubber.

bumper


'Bob Kuykendall' wrote in message
legroups.com...
Earlier, nyffeler wrote:

Slightliy of topic, but important.

NEVER use automotive brake fluid for the brakes in
gliders!
Automotive brake fluid will destroy the seals.

Except, of course, in those rare but not non-existant
cases where the
brakes were designed around automotive pistons and
seals. A good
example is the early (pre-MATCO) Rosenhan drum units
used on some 1960s
American gliders.