BRAKE FLUID

"Ian Johnston" writes:

On Wed, 13 Oct 2004 15:34:41 UTC, (Ventus B)
wrote:

The maintenance manual for my ASW 20C glider says to be sure to
only use "mineral oil" based brake fluid for the hydraulic brake
system. As far as I can tell, DOT 3 and DOT 4 brake fluids are
glycol based, and DOT 5 is silicone based according to my 15
minutes of research on the internet.

As far as I know, the only automotive mineral based brake fluids are
the LHM types used on Citroens and Rolls-Royces.

And the older `grosser' Mercs. There is now LHM2 as well.

WARNING: LHM and LHM2 are green, LHS and LHS2 are red. LHS will rip
throught your seals so fast your head will spin!

5606 is probably far easier to find in the US than LHM though.

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On Fri, 15 Oct 2004 20:22:15 UTC, wrote:

: "Ian Johnston" writes:
:
: On Wed, 13 Oct 2004 15:34:41 UTC, (Ventus B)
: wrote:

: As far as I know, the only automotive mineral based brake fluids are
: the LHM types used on Citroens and Rolls-Royces.
:
: And the older `grosser' Mercs. There is now LHM2 as well.

Sorry, maybe I should ave made that clear - it's why I wrote "LHM
types", which I meant to cover LHM, LHM2 and LHM2+. They are all
backwards compatible ...

: WARNING: LHM and LHM2 are green, LHS and LHS2 are red. LHS will rip
: throught your seals so fast your head will spin!

.... but indeed not with LHS which is more like your standard brake
fluid. And just to compete the set, LHS was the synthetic replacement
for the original castor-based Citroen hydraulic fluid. Perhaps just
LH?

Ian

I seem to remember the Grob 109A (and possibly early Dimona h36)used
Auto type fluid but then Tost or whoever changed to Aviation fluids
and this happened with G109B. It is confusing and a big clear notice
next to Master would be a good idea. A friend who had G109A in the
old days then had an ASH25E and without looking at manual used Auto
fluid before he realised the Germans had changed to Aviation with the
ASH. .........Ian McPhee Australia

Ian McPhee wrote:
I seem to remember the Grob 109A (and possibly early Dimona h36)used
Auto type fluid but then Tost or whoever changed to Aviation fluids
and this happened with G109B. It is confusing and a big clear notice
next to Master would be a good idea. A friend who had G109A in the
old days then had an ASH25E and without looking at manual used Auto
fluid before he realised the Germans had changed to Aviation with the
ASH. .........Ian McPhee Australia

The ASW 20 B/C (first delivered in 1983, I think) had the Cleveland disk
brake, which is an aviation unit, and it uses the standard aviation
fluid. I don't think you can mark a date when the "Germans" changed to
aviation fluid, but must use the manual for your particular glider (or
motor vehicle, for that matter).

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Eric Greenwell
Washington State
USA