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QUESTION: Airhart hydraulic Fluid?

I’m just fitting the 2 front Airhart hydraulic calipers and the second AirHart master cylinder on my Margay. I have a good memory, but it is short. For the life of me I can’t remember what is the best brake fluid to use in it. Any help?

Rich/Rick

non automotive red silicone based, right GUYS? I got mine at the local airport back in the mid 80's

Thank you for the info. Now all I have to do is find an airport that will sell me some.

https://www.aircraftspruce.com/catalog/ ... ckkey=4008

You can get some interesting parts and fasteners here also.

Don't Airheart brakes take a red 'mineral' based fluid ?

R.E.A.R.

MIL-H-5606A

Mineral oil based hydraulic fluid for use with brake and hydraulic systems with synthetic rubber seals. Colored red.

For reduced pricing on large volume orders, please contact sales.
Features
Meets MIL-H-5606A cleanliness requirements for aviation hydraulic oils
Superior low temperature properties
Compatibility with synthetic rubber components
Dyed red for easy identification
Good anti-wear properties

Will "MARVEL MYSTERY OIL®" that we use for air tools work?

I would not.

I was looking in my shop for something else today and found this. Not sure if it has a shelf-life.

No, mineral based brake fluid is not hygroscopic, meaning it doesn't absorb moisture from the air. DOT brake fluids, on the other hand, are hygroscopic. This means that DOT brake fluid will absorb water from the air over time, which can reduce its boiling point and lead to brake system issues.