On Mar 28, 9:09*pm, "
wrote:
On Mar 28, 7:55*pm, John Sullivan

wrote:
Standard aviation brake fluid is know as "5606". *I comes in a
red can. *Any aircraft repair facility will have lots of it and
might sell a pint when needed. *It is what use in my airplanes
equipped with Cleveland brakes.

Mil-H-56056, actually, now called MIL-PRF-5606H:

http://www.everyspec.com/MIL-SPECS/M...L-H-5606H_NOTI...

And if you have a Grob G 103, the manual will direct you to use
automotive grade DOT3, which can corrode the S*** out of the magnesium
wheel cylinders on the Cleveland wheel.

Ask me how I know....

aerodyne

I have the same direction to use DOT3 or DOT4 in my Nimbus manual. It
may be due to the use of a motorcycle master cylinder and
compatibility of the rubber o-rings and the plastic reservoir. I
haven't seen significant corrosion of the caliper parts in contact
with the DOT3 fluid. I'd be hesitant to switch to 5606 given the
plastic / rubber compatibility concerns.

Craig